The urinary system removes waste from the body through urine. It consists of the kidneys, ureters, urinary bladder, and urethra. The kidneys filter waste from the blood to form urine. The ureters then carry urine from the kidneys to the bladder. The bladder stores urine until urination, when urine passes through the urethra and out of the body. The kidneys also help regulate water balance and electrolyte levels in the blood through filtration, reabsorption, and secretion processes in the nephrons.
The document describes the four main layers that make up the walls of the alimentary canal (also known as the gastrointestinal tract): the mucosa, submucosa, muscularis externa, and serosa. The mucosa is the innermost layer that lines the canal and has functions like secreting mucus and enzymes, absorbing nutrients, and protecting against pathogens. It contains epithelial tissue, connective tissue, and smooth muscle. The submucosa lies just outside the mucosa and contains blood vessels, lymphatics, nerves and connective tissue. The muscularis externa is responsible for movements like segmentation and peristalsis through its inner circular and outer longitudinal smooth muscle layers. The outer
The urinary system consists of the kidneys, ureters, urinary bladder, and urethra. The kidneys filter waste from the blood to form urine. The urine travels from the kidneys down the ureters to the urinary bladder, where it is stored until urination. During urination, the bladder contracts and the urethra carries the urine out of the body. In addition to removing waste, the urinary system regulates fluid and electrolyte balance and blood pressure.
The document discusses the anatomy and physiology of the human ear. It describes the three main parts of the ear - the outer, middle, and inner ear. The outer ear collects sound waves. The middle ear contains three small bones that transmit vibrations through the inner ear. The inner ear contains fluid-filled structures, including the cochlea, that transduce vibrations into nerve signals for hearing and balance. The document also briefly discusses common ear disorders like infections and deafness.
This document provides information about the excretory system and its organs. It focuses on the structure and function of the kidneys. The kidneys filter waste from the blood to produce urine through processes of filtration, reabsorption, and secretion. Urine is transported from the kidneys to the urinary bladder via ureters. The bladder stores urine until urination. The kidneys play key roles in regulating water balance, electrolyte levels, blood pressure, and producing hormones.
The nose has several functions including smelling, breathing, filtering air, and draining secretions. It is divided into the external nose and nasal cavity. The nasal cavity contains convoluted bones and cartilages that warm and humidify air before it reaches the lungs. It is lined with mucosa and divided by the nasal septum into left and right sides. The nasal cavity is further divided by projections called conchae into passages and recesses where various sinuses open. Infections can spread from the nasal cavity to nearby areas like the sinuses, ears, or eyes.
The urinary system functions to regulate homeostasis by controlling water, electrolyte, and acid-base balance and eliminating waste from the body. The major organs of the urinary system include the kidneys, ureters, urinary bladder, and urethra. The kidneys filter waste from the blood to form urine and are made up of nephrons, the functional units that filter blood and remove waste. Urine is formed through the processes of filtration, reabsorption, and secretion in the nephrons and is temporarily stored in the bladder before being excreted through the urethra.
An important system of our body is known as digestive system which has its own role to play. This step of digestion serves as as a next route to the steps of absorption of nutrients by the small intestine and its respective transportation to the cells and tissues. This slide focuses on the different organs of digestion and their functions .
The document provides information about the excretory/renal system. It discusses the key parts of the system including the kidneys, ureters, bladder and urethra. The kidneys filter waste from the blood and regulate fluid levels and electrolyte balance. Key structures within the kidneys are described like nephrons, which are the functional filtering units. Processes like filtration, reabsorption and secretion are explained in how the kidneys form and regulate urine composition. Learning objectives are also outlined to characterize each part's role and illustrate the kidney's microscopic and macroscopic structures.
The document describes the four main layers that make up the walls of the alimentary canal (also known as the gastrointestinal tract): the mucosa, submucosa, muscularis externa, and serosa. The mucosa is the innermost layer that lines the canal and has functions like secreting mucus and enzymes, absorbing nutrients, and protecting against pathogens. It contains epithelial tissue, connective tissue, and smooth muscle. The submucosa lies just outside the mucosa and contains blood vessels, lymphatics, nerves and connective tissue. The muscularis externa is responsible for movements like segmentation and peristalsis through its inner circular and outer longitudinal smooth muscle layers. The outer
The urinary system consists of the kidneys, ureters, urinary bladder, and urethra. The kidneys filter waste from the blood to form urine. The urine travels from the kidneys down the ureters to the urinary bladder, where it is stored until urination. During urination, the bladder contracts and the urethra carries the urine out of the body. In addition to removing waste, the urinary system regulates fluid and electrolyte balance and blood pressure.
The document discusses the anatomy and physiology of the human ear. It describes the three main parts of the ear - the outer, middle, and inner ear. The outer ear collects sound waves. The middle ear contains three small bones that transmit vibrations through the inner ear. The inner ear contains fluid-filled structures, including the cochlea, that transduce vibrations into nerve signals for hearing and balance. The document also briefly discusses common ear disorders like infections and deafness.
This document provides information about the excretory system and its organs. It focuses on the structure and function of the kidneys. The kidneys filter waste from the blood to produce urine through processes of filtration, reabsorption, and secretion. Urine is transported from the kidneys to the urinary bladder via ureters. The bladder stores urine until urination. The kidneys play key roles in regulating water balance, electrolyte levels, blood pressure, and producing hormones.
The nose has several functions including smelling, breathing, filtering air, and draining secretions. It is divided into the external nose and nasal cavity. The nasal cavity contains convoluted bones and cartilages that warm and humidify air before it reaches the lungs. It is lined with mucosa and divided by the nasal septum into left and right sides. The nasal cavity is further divided by projections called conchae into passages and recesses where various sinuses open. Infections can spread from the nasal cavity to nearby areas like the sinuses, ears, or eyes.
The urinary system functions to regulate homeostasis by controlling water, electrolyte, and acid-base balance and eliminating waste from the body. The major organs of the urinary system include the kidneys, ureters, urinary bladder, and urethra. The kidneys filter waste from the blood to form urine and are made up of nephrons, the functional units that filter blood and remove waste. Urine is formed through the processes of filtration, reabsorption, and secretion in the nephrons and is temporarily stored in the bladder before being excreted through the urethra.
An important system of our body is known as digestive system which has its own role to play. This step of digestion serves as as a next route to the steps of absorption of nutrients by the small intestine and its respective transportation to the cells and tissues. This slide focuses on the different organs of digestion and their functions .
The document provides information about the excretory/renal system. It discusses the key parts of the system including the kidneys, ureters, bladder and urethra. The kidneys filter waste from the blood and regulate fluid levels and electrolyte balance. Key structures within the kidneys are described like nephrons, which are the functional filtering units. Processes like filtration, reabsorption and secretion are explained in how the kidneys form and regulate urine composition. Learning objectives are also outlined to characterize each part's role and illustrate the kidney's microscopic and macroscopic structures.
This is about the general physiology of sense organs for medical and paramedical professional beginners who choose pharmacy, nursing and physiotherapy to study.
The blood vessels are the components of the circulatory system that transport blood throughout the human body. These vessels transport blood cells, nutrients, and oxygen to the tissues of the body. They also take waste and carbon dioxide away from the tissues.
The lymphatic system is part of the circulatory system and immune system. It is composed of a network of lymphatic vessels that carry lymph fluid towards the heart. Lymph contains plasma constituents too large to pass through blood capillaries, such as macroparticles from damaged areas. Lymphatic vessels originate as blind-ended tubes and contain valves to prevent backflow. They join to form larger vessels and ducts that drain into veins. Lymph nodes filter lymph and activate immune cells. Key lymphatic organs include the spleen, bone marrow, thymus gland and tonsils, which help generate and select lymphocytes.
The heart is a hollow muscular organ responsible for pumping blood through the circulatory system. It has four chambers: right atrium, right ventricle, left atrium, and left ventricle. The heart is surrounded by membranes and has three layers - epicardium, myocardium, and endocardium. It is located in the chest cavity and pumps oxygenated blood received from the lungs through the left side of the heart to the entire body. The heart has four valves that prevent backflow of blood - tricuspid valve, pulmonary valve, mitral valve, and aortic valve.
Tissues- types and functions, glands and membranes bhartisharma175
it consist of tissues their types, glands and membranes. it also consist of colorful images which will help the students to identify and differentiate the different types of tissues from one another. different types of glands and membranes are also explained with the help of images.
The circulatory system transports blood around the body using the heart as a pump and a network of arteries, veins and capillaries. Deoxygenated blood enters the right side of the heart and is pumped to the lungs, where it receives oxygen and returns to the left side to be pumped through the body. Blood pressure is highest when the heart contracts and lowest when it relaxes. Nerves regulate heart rate and blood vessel diameter in response to stress and activity levels.
The kidneys produce urine through three main processes:
1) Filtration of water and dissolved substances from the blood in the glomeruli into the Bowman's capsule.
2) Reabsorption of water, nutrients like glucose, and ions like sodium out of the kidney tubules and back into the bloodstream, preventing their loss in urine.
3) Secretion of substances like hydrogen and potassium ions, ammonia, and drugs from the blood into the kidney tubules to be eliminated in urine, which helps regulate acid-base balance.
The urinary system's function is to filter blood and create urine as a waste by-product. The organs of the urinary system include the kidneys, renal pelvis, ureters, bladder and urethra. The body takes nutrients from food and converts them to energy.
The urinary system consists of the kidneys, ureters, bladder, and urethra, which work together to produce and excrete urine. The kidneys filter waste from the blood to produce urine, which travels through the ureters to the bladder. When full, the bladder empties through the urethra. Urine contains water and waste products like urea, salts, and other dissolved substances. Dysfunctions like incontinence, retention, infection, or changes in urine production can indicate underlying issues.
The document summarizes the functions of lymph in the human body. It states that at the end of the seminar, students should understand: 1) the function of lymph, 2) how lymph enhances immune system efficiency, and 3) how cancer can spread through lymph nodes. It then lists and describes six key functions of lymph: transporting proteins and fat, maintaining blood volume, aiding urine concentration, supplying nutrition and oxygen, and enhancing immune system efficiency.
The heart is a cone-shaped organ located in the chest cavity between the lungs. It is surrounded by fluid-filled sac called the pericardium. The heart has four chambers - two upper atria that receive blood and two lower ventricles that pump blood out. Blood flows through valves from the atria to ventricles and then out arteries or pulmonary artery. The heart's wall has three layers - outer epicardium, middle muscular myocardium, and inner endocardium. The heart continuously contracts and relaxes in a cardiac cycle of diastole and systole to pump blood through the body.
The urinary system consists of two kidneys, two ureters, one urinary bladder, and one urethra. The kidneys filter the blood and produce urine by regulating ions, volume, pH, and producing hormones. Urine passes from the kidneys to the bladder via the ureters. The bladder stores urine which is then expelled through the urethra. The functional unit of the kidney is the nephron, which filters blood and reabsorbs needed substances while secreting waste for urine production.
The renal system consists of the kidneys and urinary bladder. The kidneys play a vital role in maintaining fluid balance and composition in the body, regulating the internal environment. The kidneys are composed of nephrons which filter blood, reabsorbing necessary substances and secreting waste products to produce urine. Urine is stored in the bladder and emptied during micturition.
Anatomy and physiology of the Urinary system by Dipali HarkhaniDipali Harkhani
The document summarizes the anatomy and physiology of the urinary system. It describes the main components of the urinary system as the kidneys, ureters, bladder, and urethra. The kidneys filter waste from the blood to produce urine, which travels through the ureters to the bladder. The bladder stores urine until urination, when urine exits through the urethra. The nephron is the functional unit of the kidney that filters blood and modifies it into urine through processes of filtration, reabsorption, and secretion.
The document classifies bones into five categories based on shape: long bones, short bones, flat bones, irregular bones, and sesamoid bones. It provides examples of bones that fall into each category and describes their typical shapes and functions. The key functions of bones are listed as support, protection, movement, mineral and growth factor storage, and blood cell formation.
The urinary system, components, the urine formation process, The gross structure of the kidney, Microscope structure of the kidney, Renin-Angiotensin Aldosterone System
The document summarizes the anatomy and physiology of the five special senses - vision, hearing, taste, smell, and touch. It provides details on the structure and function of the eye, ear, olfactory system, and somatosensory system. The eye section describes the external structures like the eyelids and lacrimal system, internal structures of the eyeball including the retina and lens, and eye reflexes. The ear section outlines the external, middle, and inner ear, describing the tympanic membrane, ossicles, cochlea, and vestibular system. The chemical senses of taste and smell are also summarized.
The ear is divided into three parts: the outer, middle, and inner ear. The outer ear collects sound waves and directs them through the external auditory canal to the eardrum. The middle ear contains three small bones (ossicles) that amplify vibrations through bone conduction to the inner ear. The inner ear converts vibrations into neural signals for hearing and balance via the cochlea and semicircular canals. Sound waves are transduced into mechanical, then hydraulic, then electrical energy as they travel through the ear to be interpreted by the brain.
he sense organs — eyes, ears, tongue, skin, and nose — help to protect the body. The human sense organs contain receptors that relay information through sensory neurons to the appropriate places within the nervous system.
Each sense organ contains different receptors.
General receptors are found throughout the body because they are present in skin, visceral organs (visceral meaning in the abdominal cavity), muscles, and joints.
Special receptors include chemoreceptors (chemical receptors) found in the mouth and nose, photoreceptors (light receptors) found in the eyes, and mechanoreceptors found in the ears.
The document provides an overview of the urinary system, including its main organs and functions. It describes the anatomy and histology of the kidney, nephron, ureters, and urinary bladder. It explains the three main processes of urine formation - glomerular filtration, reabsorption, and secretion. It also discusses some common urinary tract diseases and the relationships between the urinary system and other body systems.
The document provides an overview of the urinary system, including the anatomy and functions of the kidneys and other components. The kidneys filter blood to remove waste and regulate fluid balance. The nephron is the functional unit of the kidney that filters blood and reabsorbs water and nutrients while secreting wastes. Urine is stored in the bladder and eliminated through the urethra under voluntary control.
This is about the general physiology of sense organs for medical and paramedical professional beginners who choose pharmacy, nursing and physiotherapy to study.
The blood vessels are the components of the circulatory system that transport blood throughout the human body. These vessels transport blood cells, nutrients, and oxygen to the tissues of the body. They also take waste and carbon dioxide away from the tissues.
The lymphatic system is part of the circulatory system and immune system. It is composed of a network of lymphatic vessels that carry lymph fluid towards the heart. Lymph contains plasma constituents too large to pass through blood capillaries, such as macroparticles from damaged areas. Lymphatic vessels originate as blind-ended tubes and contain valves to prevent backflow. They join to form larger vessels and ducts that drain into veins. Lymph nodes filter lymph and activate immune cells. Key lymphatic organs include the spleen, bone marrow, thymus gland and tonsils, which help generate and select lymphocytes.
The heart is a hollow muscular organ responsible for pumping blood through the circulatory system. It has four chambers: right atrium, right ventricle, left atrium, and left ventricle. The heart is surrounded by membranes and has three layers - epicardium, myocardium, and endocardium. It is located in the chest cavity and pumps oxygenated blood received from the lungs through the left side of the heart to the entire body. The heart has four valves that prevent backflow of blood - tricuspid valve, pulmonary valve, mitral valve, and aortic valve.
Tissues- types and functions, glands and membranes bhartisharma175
it consist of tissues their types, glands and membranes. it also consist of colorful images which will help the students to identify and differentiate the different types of tissues from one another. different types of glands and membranes are also explained with the help of images.
The circulatory system transports blood around the body using the heart as a pump and a network of arteries, veins and capillaries. Deoxygenated blood enters the right side of the heart and is pumped to the lungs, where it receives oxygen and returns to the left side to be pumped through the body. Blood pressure is highest when the heart contracts and lowest when it relaxes. Nerves regulate heart rate and blood vessel diameter in response to stress and activity levels.
The kidneys produce urine through three main processes:
1) Filtration of water and dissolved substances from the blood in the glomeruli into the Bowman's capsule.
2) Reabsorption of water, nutrients like glucose, and ions like sodium out of the kidney tubules and back into the bloodstream, preventing their loss in urine.
3) Secretion of substances like hydrogen and potassium ions, ammonia, and drugs from the blood into the kidney tubules to be eliminated in urine, which helps regulate acid-base balance.
The urinary system's function is to filter blood and create urine as a waste by-product. The organs of the urinary system include the kidneys, renal pelvis, ureters, bladder and urethra. The body takes nutrients from food and converts them to energy.
The urinary system consists of the kidneys, ureters, bladder, and urethra, which work together to produce and excrete urine. The kidneys filter waste from the blood to produce urine, which travels through the ureters to the bladder. When full, the bladder empties through the urethra. Urine contains water and waste products like urea, salts, and other dissolved substances. Dysfunctions like incontinence, retention, infection, or changes in urine production can indicate underlying issues.
The document summarizes the functions of lymph in the human body. It states that at the end of the seminar, students should understand: 1) the function of lymph, 2) how lymph enhances immune system efficiency, and 3) how cancer can spread through lymph nodes. It then lists and describes six key functions of lymph: transporting proteins and fat, maintaining blood volume, aiding urine concentration, supplying nutrition and oxygen, and enhancing immune system efficiency.
The heart is a cone-shaped organ located in the chest cavity between the lungs. It is surrounded by fluid-filled sac called the pericardium. The heart has four chambers - two upper atria that receive blood and two lower ventricles that pump blood out. Blood flows through valves from the atria to ventricles and then out arteries or pulmonary artery. The heart's wall has three layers - outer epicardium, middle muscular myocardium, and inner endocardium. The heart continuously contracts and relaxes in a cardiac cycle of diastole and systole to pump blood through the body.
The urinary system consists of two kidneys, two ureters, one urinary bladder, and one urethra. The kidneys filter the blood and produce urine by regulating ions, volume, pH, and producing hormones. Urine passes from the kidneys to the bladder via the ureters. The bladder stores urine which is then expelled through the urethra. The functional unit of the kidney is the nephron, which filters blood and reabsorbs needed substances while secreting waste for urine production.
The renal system consists of the kidneys and urinary bladder. The kidneys play a vital role in maintaining fluid balance and composition in the body, regulating the internal environment. The kidneys are composed of nephrons which filter blood, reabsorbing necessary substances and secreting waste products to produce urine. Urine is stored in the bladder and emptied during micturition.
Anatomy and physiology of the Urinary system by Dipali HarkhaniDipali Harkhani
The document summarizes the anatomy and physiology of the urinary system. It describes the main components of the urinary system as the kidneys, ureters, bladder, and urethra. The kidneys filter waste from the blood to produce urine, which travels through the ureters to the bladder. The bladder stores urine until urination, when urine exits through the urethra. The nephron is the functional unit of the kidney that filters blood and modifies it into urine through processes of filtration, reabsorption, and secretion.
The document classifies bones into five categories based on shape: long bones, short bones, flat bones, irregular bones, and sesamoid bones. It provides examples of bones that fall into each category and describes their typical shapes and functions. The key functions of bones are listed as support, protection, movement, mineral and growth factor storage, and blood cell formation.
The urinary system, components, the urine formation process, The gross structure of the kidney, Microscope structure of the kidney, Renin-Angiotensin Aldosterone System
The document summarizes the anatomy and physiology of the five special senses - vision, hearing, taste, smell, and touch. It provides details on the structure and function of the eye, ear, olfactory system, and somatosensory system. The eye section describes the external structures like the eyelids and lacrimal system, internal structures of the eyeball including the retina and lens, and eye reflexes. The ear section outlines the external, middle, and inner ear, describing the tympanic membrane, ossicles, cochlea, and vestibular system. The chemical senses of taste and smell are also summarized.
The ear is divided into three parts: the outer, middle, and inner ear. The outer ear collects sound waves and directs them through the external auditory canal to the eardrum. The middle ear contains three small bones (ossicles) that amplify vibrations through bone conduction to the inner ear. The inner ear converts vibrations into neural signals for hearing and balance via the cochlea and semicircular canals. Sound waves are transduced into mechanical, then hydraulic, then electrical energy as they travel through the ear to be interpreted by the brain.
he sense organs — eyes, ears, tongue, skin, and nose — help to protect the body. The human sense organs contain receptors that relay information through sensory neurons to the appropriate places within the nervous system.
Each sense organ contains different receptors.
General receptors are found throughout the body because they are present in skin, visceral organs (visceral meaning in the abdominal cavity), muscles, and joints.
Special receptors include chemoreceptors (chemical receptors) found in the mouth and nose, photoreceptors (light receptors) found in the eyes, and mechanoreceptors found in the ears.
The document provides an overview of the urinary system, including its main organs and functions. It describes the anatomy and histology of the kidney, nephron, ureters, and urinary bladder. It explains the three main processes of urine formation - glomerular filtration, reabsorption, and secretion. It also discusses some common urinary tract diseases and the relationships between the urinary system and other body systems.
The document provides an overview of the urinary system, including the anatomy and functions of the kidneys and other components. The kidneys filter blood to remove waste and regulate fluid balance. The nephron is the functional unit of the kidney that filters blood and reabsorbs water and nutrients while secreting wastes. Urine is stored in the bladder and eliminated through the urethra under voluntary control.
The document provides an overview of kidney anatomy and physiology. It discusses:
1. The basic functions and structures of the kidney, including filtration, homeostasis, and hormone production.
2. The anatomy of the kidney, including locations of the cortex, medulla, renal pyramids and other structures.
3. The nephron as the functional unit of the kidney, describing its role in filtration, reabsorption, secretion and other processes.
4. Key physiological concepts like the countercurrent multiplier mechanism and regulation of electrolytes and acid-base balance.
The document provides an overview of kidney anatomy and physiology. It describes the key functions of the kidney which include excretion of wastes, regulation of water and electrolyte balance, and hormone production. The basic functional unit of the kidney, the nephron, is explained in detail. The nephron is responsible for filtering blood to form urine via processes like glomerular filtration, reabsorption and secretion. The countercurrent multiplier system involving the loop of Henle is also described, which helps concentrate urine.
The document summarizes key aspects of excretion and the kidney's role in excretion and maintaining water balance. It describes the three main processes involved - ultrafiltration in the malpighian body, selective reabsorption in the proximal convoluted tubule, and urine formation in the loop of henle and collecting duct. It also outlines the structures of the nephron and kidney, and how different regions work together to filter and regulate blood content.
The urinary system consists of the kidneys, ureters, urinary bladder, and urethra. The kidneys filter waste from the blood to produce urine. Each kidney contains approximately 1 million nephrons, the functional units of filtration. In the nephrons, blood is filtered in the glomerulus and the filtrate is processed and regulated in the renal tubules to form urine. Hormones like aldosterone and antidiuretic hormone help regulate water and electrolyte balance to control blood pressure, volume, and pH. The kidneys also regulate red blood cell production and blood glucose levels through hormone secretion.
The urinary system consists of the kidneys, ureters, urinary bladder, and urethra. The kidneys filter waste from the blood to produce urine. Urine travels from the kidneys down the ureters into the urinary bladder, where it is stored until urination. The urethra then carries urine from the bladder out of the body. The kidneys contain nephrons, which filter the blood, reabsorb useful substances, and secrete waste products to form urine and maintain homeostasis.
The urinary system filters wastes from the blood and regulates fluid balance. The kidneys contain nephrons which filter blood to form urine. Urine passes from nephrons to the bladder through ureters for storage and eventual elimination. Key functions of the kidneys include filtering wastes, regulating fluid and electrolyte balance, and producing hormones. Urine is formed through glomerular filtration, tubular reabsorption and secretion, and concentration in the collecting duct.
The urinary system maintains homeostasis by filtering the blood and regulating fluid volume and composition. It includes the kidneys, ureters, urinary bladder, and urethra. The kidneys filter blood to produce urine, removing waste and regulating electrolytes. Urine moves from the kidneys to the bladder via ureters and is expelled via the urethra. Precise regulation of filtration, reabsorption, and secretion allow the urinary system to maintain fluid balance and blood composition.
Urinary System By Dr. Bhagat Singh Jaiswal (1).pdfAmitDubey431477
The urinary system plays a vital role in homeostasis. It consists of the kidneys, ureters, urinary bladder, and urethra. The kidneys contain nephrons, which are the functional filtering units. Each nephron contains a renal corpuscle for blood filtration and a renal tubule. Urine is formed through glomerular filtration, tubular reabsorption of useful substances, and tubular secretion of wastes. The kidneys regulate water and electrolyte balance and remove nitrogenous wastes from the blood.
Excretory Products And Their Elimination Class 11thNehaRohtagi1
Created By: NehaRohtagi1
Class 11th CBSE [NCERT]
Biology Chapter 17
Notes on the topic: Excretory Products And Their Elimination
For Class - 11th
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The urinary system consists of the kidneys, ureters, urinary bladder, and urethra. The kidneys filter waste from the blood to produce urine. The urine passes through the ureters to the bladder, where it is stored until excretion through the urethra. The kidneys play a vital role in regulating water balance and electrolyte levels in the body by selectively reabsorbing needed substances and secreting waste through urine production. The urinary system works to maintain homeostasis in the body.
The document discusses renal physiology and the urinary system. It contains the following key points:
1. The urinary system includes the kidneys, ureters, bladder, and urethra. The kidneys contain nephrons which filter blood to form urine.
2. The kidneys regulate fluid volume, electrolyte and acid-base balance, and remove waste. Nephrons contain a renal corpuscle for filtration and a tubule for reabsorption and secretion.
3. The proximal convoluted tubule reabsorbs the majority of filtered sodium, water, and other electrolytes using active transport mechanisms like sodium-glucose co-transport. This maintains electrolyte and fluid balance
The kidneys perform several important functions including filtering the blood to remove wastes and regulate fluid levels. The kidneys contain millions of nephrons which are the functional units that filter blood to form urine. Glomerular filtration occurs where blood is filtered through tiny blood vessels into Bowman's capsule. Most of the filtered fluid is then reabsorbed back into blood vessels, with only 1% remaining as urine. Tubular secretion also adds unwanted substances to the urine. Urine is transported to the bladder via ureters and stored until elimination through the urethra. The kidneys help maintain electrolyte, acid-base, and fluid balance.
1. The document describes the structure and function of the nephron, the basic structural and functional unit of the kidney. It details the two main parts of each nephron - the renal corpuscle and renal tubule.
2. The renal corpuscle includes the glomerulus, a capillary network, and Bowman's capsule, which encloses the glomerulus. The renal tubule consists of the proximal convoluted tubule, loop of Henle, and distal convoluted tubule.
3. Urine is formed through glomerular filtration, tubular reabsorption, and tubular secretion as fluid passes through the nephron. Most reabsorption occurs in the proximal convol
The document discusses the urinary system. It defines the urinary system and lists its main organs as the kidneys, ureters, bladder, and urethra. It then provides details on the location, size and weight of the kidneys. It describes the structures and functions of nephrons, and explains how nephrons filter blood and form urine through processes like filtration, reabsorption and secretion. Finally, it briefly discusses the roles of other urinary organs like the ureters, bladder and urethra, as well as the micturition process.
The urinary system consists of two kidneys, two ureters, one urinary bladder, and one urethra. The kidneys filter wastes from the blood and regulate fluid and electrolyte balance. Each kidney contains over a million nephrons, the functional units that filter blood in the glomerulus and reabsorb useful substances along the renal tubules. The kidneys secrete urine that travels through ureters to the bladder, where it is temporarily stored then expelled through the urethra. The urinary system plays critical roles in homeostasis by filtering wastes and regulating water, electrolyte, and acid-base balance.
Excretory system and its brief discussionরেজা তানজিল
The excretory system is a passive biological system that removes excess, unnecessary materials from the body fluids of an organism, so as to help maintain internal chemical homeostasis and prevent damage to the body. The dual function of excretory systems is the elimination of the waste products of metabolism and to drain the body of used up and broken down components in a liquid and gaseous state. In humans and other amniotes (mammals, birds and reptiles) most of these substances leave the body as urine and to some degree exhalation, mammals also expel them through sweating.
Only the organs specifically used for the excretion are considered a part of the excretory system. In the narrow sense, the term refer to the urinary system. However, as excretion involves several functions that are only superficially related, it is not usually used in more formal classifications of anatomy or function.
As most healthy functioning organs produce metabolic and other wastes, the entire organism depends on the function of the system. Breaking down of one of more of the systems is a serious health condition, for example kidney failure.
The urinary system includes the kidneys, ureters, bladder, and urethra. The kidneys filter the blood to remove wastes and produce urine. The urine passes through the ureters to the bladder for storage and then exits the body through the urethra. Key functions of the kidneys include filtering blood to remove wastes and regulate fluid and electrolyte balance. The nephron is the functional unit of the kidney that filters blood and reabsorbs necessary molecules while secreting wastes into urine.
The document discusses the structure and function of the respiratory system. It can be summarized as follows:
1) The respiratory system is divided into an upper and lower portion. The upper portion includes the nose, nasal cavity and pharynx, while the lower portion includes the larynx, trachea, bronchi and lungs.
2) Gas exchange occurs in the lungs through diffusion of oxygen and carbon dioxide between the alveoli and blood in the pulmonary capillaries. The partial pressures of oxygen and carbon dioxide drive this diffusion.
3) Respiration is regulated by both nervous and chemical mechanisms. The brain stem contains centers that control automatic breathing, while voluntary control occurs in the cerebral cortex.
The lymphatic system consists of lymph, lymph vessels, lymph nodes, and lymphatic organs such as the spleen, thymus gland, tonsils, and bone marrow. It works with the circulatory system to fight infection, remove waste, and transport dietary fats. Lymph is a fluid containing white blood cells that flows through lymph vessels and nodes before entering the bloodstream. Lymph nodes filter the lymph and contain immune cells that fight infection. Blockage or damage to the lymphatic system can cause lymphedema or spread of infection and cancer.
Blood is a connective tissue composed of plasma and cellular elements. Plasma is 55% of blood and contains water, proteins, nutrients, gases, and electrolytes. It transports these throughout the body. The cellular elements are red blood cells, white blood cells, and platelets. Red blood cells contain hemoglobin and transport oxygen and carbon dioxide. White blood cells help fight infection in different ways. Platelets help the blood clot and prevent bleeding. The study of blood is called hematology.
The cardiac cycle describes the sequence of events in the heart between two subsequent contractions. It consists of atrial systole, ventricular systole, atrial diastole, and ventricular diastole. During atrial systole, the atria contract and pump blood into the ventricles. Ventricular systole follows, where the ventricles contract and eject blood from the heart. The electrocardiogram (ECG) records the electrical activity of the heart throughout the cardiac cycle, represented by the P, Q, R, S, and T waves.
There are three types of blood vessels - arteries, veins, and capillaries. Arteries transport blood away from the heart to tissues and have thick muscular walls to withstand high pressure. Veins return low pressure blood to the heart and have thinner walls. Capillaries are the smallest vessels that connect arteries and veins. The lymphatic system includes lymphatic vessels, lymph nodes, and organs like the thymus and spleen. Lymphatic vessels carry lymph fluid from tissues through lymph nodes, which filter the lymph, and ultimately return it to the bloodstream. The thymus and spleen both play roles in the immune system.
This document discusses blood groups and the ABO blood grouping system. It explains that there are antigens on red blood cells and corresponding antibodies in the plasma. Karl Landsteiner discovered that if a red blood cell has an antigen, the plasma will lack the corresponding antibody, and vice versa. The ABO blood grouping system identifies four main blood types - A, B, AB, and O - based on the presence or absence of A and B antigens on red blood cells and anti-A and anti-B antibodies in the plasma. The document also provides information on inheritance, population distribution, antigen and antibody development over time, and donor-recipient matching in blood transfusions.
Blood clotting is a process called coagulation where blood loses fluidity and forms a mesh of fibrin fibrils entangling blood cells. There are 12 coagulation factors involved in a sequential process to convert fibrinogen into fibrin. First, the extrinsic and intrinsic pathways form prothrombin activator which converts prothrombin to thrombin. Thrombin then converts fibrinogen to fibrin to form the clot. Anticoagulants like heparin and warfarin prevent clotting by interfering with parts of this coagulation cascade.
Erik Erikson proposed a theory of psychosocial development consisting of 8 stages from infancy to late adulthood. At each stage, individuals face a psychosocial crisis that can result in a healthy or unhealthy outcome. The stages involve developing trust vs mistrust as an infant, autonomy vs shame as a toddler, initiative vs guilt as a young child, industry vs inferiority in middle childhood, identity vs role confusion in adolescence, intimacy vs isolation in young adulthood, generativity vs stagnation in middle adulthood, and integrity vs despair in late adulthood. Successful completion of each stage leads to the acquisition of basic virtues and a healthy personality development.
This document discusses ego defense mechanisms, which are unconscious psychological strategies used to reduce anxiety and protect the ego. It defines defense mechanisms, provides examples, and classifies them from primitive to mature. The key defense mechanisms discussed are rationalization, regression, sublimation, withdrawal, displacement, denial, identification, fantasy, compensation, repression, reaction formation, and projection. The document emphasizes that while defense mechanisms help reduce anxiety, overusing them can become an unhealthy habit.
1. Psychiatric–mental health nursing is a specialized area of nursing committed to promoting mental health through assessing, diagnosing, and treating behavioral problems, psychiatric disorders, and comorbid conditions using a combination of nursing skills, psychosocial interventions, and neurobiological research.
2. Psychiatric nurses work in a variety of clinical settings across the continuum of care providing services like health promotion, case management, providing therapeutic environments, administering treatment regimens, crisis intervention, and psychiatric rehabilitation.
3. Registered psychiatric nurses provide psychiatric care to individuals, families, and groups to help them function at an optimal level of psychological wellness through more effective behaviors and increased resilience to stress.
The document discusses the importance of teamwork in mental healthcare. It notes that effective teamwork requires coordinated efforts from professionals in psychiatry, psychiatric nursing, clinical psychology, and psychiatric social work. Each discipline plays a vital role in assessing, diagnosing, treating, and rehabilitating patients. The document likens the team to an orchestra, where each member's individual contributions must be coordinated to achieve the overall goal of helping patients recover. It then provides more details on the roles of specific professionals that make up the core mental healthcare team.
This document provides an overview of psychiatric nursing and defines key terms used in diagnosing and treating mental health issues. It begins with a definition of psychiatric nursing from the American Nurses Association emphasizing the use of human behavior theories and self-care. It then lists and defines 68 terms related to mental health diagnoses, symptoms, and treatment approaches. Finally, it discusses the history and development of international classification systems for mental disorders from ICD-8 to ICD-10 and how they have been modified for use in India.
The document traces the history of psychiatry and psychiatric nursing from ancient times to the present. It discusses how mental illness was viewed and treated in early civilizations, then outlines key periods in the history of psychiatry including periods of persecution, segregation, and the development of more humane and scientific approaches. It notes important developments and individuals that advanced the field of psychiatry as well as the professionalization of psychiatric nursing.
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The document discusses organic brain disorders including their classification in ICD-10, definitions, etiology, clinical features, diagnosis, treatment and nursing management. It covers various organic brain disorders like dementia, delirium, organic amnestic syndrome, mental disorders due to brain damage/dysfunction, and personality/behavioral disorders due to brain disease. Dementia is characterized by cognitive decline and memory problems, while delirium involves acute changes in consciousness and cognition. Nursing aims to meet patients' needs, maintain safety, and alleviate distressing symptoms of organic brain disorders.
The document discusses substance use disorders and provides information on various substances of abuse including alcohol, opioids, cannabis, cocaine, amphetamines, and lysergic acid diethylamide (LSD). It covers terminology, classifications, etiology, effects of acute intoxication and withdrawal, complications, treatments, and diagnostic criteria for substance use disorders involving these classes of drugs.
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1. The document discusses various neurotic, stress-related and somatoform disorders including anxiety disorders, phobic disorders, obsessive compulsive disorder, and somatoform disorders.
2. It provides classifications of these disorders based on the ICD-10 system and describes key features, symptoms, etiologies, and treatment approaches for each disorder type.
3. Treatment typically involves a multimodal approach including psychotherapy, relaxation techniques, drug therapies like antidepressants, and in more severe cases of OCD, electroconvulsive therapy or psychosurgery may be used.
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The document discusses spinal nerves, which originate from the spinal cord and communicate signals between the spinal cord and specific body regions. There are 31 pairs of spinal nerves that emerge from the spinal cord through openings in the vertebrae. Spinal nerves are classified based on their region of origin - cervical, thoracic, lumbar, sacral and coccygeal. After exiting the vertebrae, spinal nerves branch and form networks called plexuses that innervate different body parts. The major plexuses are the cervical, brachial, lumbar, sacral and coccygeal plexuses.
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Furthermore, the time constraints and workload in healthcare settings can make it challenging for caregivers to prioritise safe patient handling Australia practices, leading to shortcuts and increased risks.
This particular slides consist of- what is hypotension,what are it's causes and it's effect on body, risk factors, symptoms,complications, diagnosis and role of physiotherapy in it.
This slide is very helpful for physiotherapy students and also for other medical and healthcare students.
Here is the summary of hypotension:
Hypotension, or low blood pressure, is when the pressure of blood circulating in the body is lower than normal or expected. It's only a problem if it negatively impacts the body and causes symptoms. Normal blood pressure is usually between 90/60 mmHg and 120/80 mmHg, but pressures below 90/60 are generally considered hypotensive.
PET CT beginners Guide covers some of the underrepresented topics in PET CTMiadAlsulami
This lecture briefly covers some of the underrepresented topics in Molecular imaging with cases , such as:
- Primary pleural tumors and pleural metastases.
- Distinguishing between MPM and Talc Pleurodesis.
- Urological tumors.
- The role of FDG PET in NET.
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Exploring the Benefits of Binaural Hearing: Why Two Hearing Aids Are Better T...Ear Solutions (ESPL)
Binaural hearing using two hearing aids instead of one offers numerous advantages, including improved sound localization, enhanced sound quality, better speech understanding in noise, reduced listening effort, and greater overall satisfaction. By leveraging the brain’s natural ability to process sound from both ears, binaural hearing aids provide a more balanced, clear, and comfortable hearing experience. If you or a loved one is considering hearing aids, consult with a hearing care professional at Ear Solutions hearing aid clinic in Mumbai to explore the benefits of binaural hearing and determine the best solution for your hearing needs. Embracing binaural hearing can lead to a richer, more engaging auditory experience and significantly improve your quality of life.
International Cancer Survivors Day is celebrated during June, placing the spotlight not only on cancer survivors, but also their caregivers.
CANSA has compiled a list of tips and guidelines of support:
https://cansa.org.za/who-cares-for-cancer-patients-caregivers/
The facial nerve, also known as cranial nerve VII, is one of the 12 cranial nerves originating from the brain. It's a mixed nerve, meaning it contains both sensory and motor fibres, and it plays a crucial role in controlling various facial muscles, as well as conveying sensory information from the taste buds on the anterior two-thirds of the tongue.
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Introduction: Substance use education is crucial due to its prevalence and societal impact.
Alcohol Use: Immediate and long-term risks include impaired judgment, health issues, and social consequences.
Tobacco Use: Immediate effects include increased heart rate, while long-term risks encompass cancer and heart disease.
Drug Use: Risks vary depending on the drug type, including health and psychological implications.
Prevention Strategies: Education, healthy coping mechanisms, community support, and policies are vital in preventing substance use.
Harm Reduction Strategies: Safe use practices, medication-assisted treatment, and naloxone availability aim to reduce harm.
Seeking Help for Addiction: Recognizing signs, available treatments, support systems, and resources are essential for recovery.
Personal Stories: Real stories of recovery emphasize hope and resilience.
Interactive Q&A: Engage the audience and encourage discussion.
Conclusion: Recap key points and emphasize the importance of awareness, prevention, and seeking help.
Resources: Provide contact information and links for further support.
Letter to MREC - application to conduct studyAzreen Aj
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Discover the groundbreaking advancements in stem cell therapy by R3 Stem Cell, offering new hope for women with ovarian failure. This innovative treatment aims to restore ovarian function, improve fertility, and enhance overall well-being, revolutionizing reproductive health for women worldwide.
2024 HIPAA Compliance Training Guide to the Compliance OfficersConference Panel
Join us for a comprehensive 90-minute lesson designed specifically for Compliance Officers and Practice/Business Managers. This 2024 HIPAA Training session will guide you through the critical steps needed to ensure your practice is fully prepared for upcoming audits. Key updates and significant changes under the Omnibus Rule will be covered, along with the latest applicable updates for 2024.
Key Areas Covered:
Texting and Email Communication: Understand the compliance requirements for electronic communication.
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Medical Messaging and Voice Data: Ensure secure handling of sensitive information.
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Why Attend:
Expert Instructor: Brian Tuttle, with over 20 years in Health IT and Compliance Consulting, brings invaluable experience and knowledge, including insights from over 1000 risk assessments and direct dealings with Office of Civil Rights HIPAA auditors.
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Ensure your compliance strategy is up-to-date and effective. Enroll now and be prepared for the 2024 HIPAA audits.
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https://conferencepanel.com/conference/hipaa-training-for-the-compliance-officer-2024-updates
Let's Talk About It: Breast Cancer (What is Mindset and Does it Really Matter?)bkling
Your mindset is the way you make sense of the world around you. This lens influences the way you think, the way you feel, and how you might behave in certain situations. Let's talk about mindset myths that can get us into trouble and ways to cultivate a mindset to support your cancer survivorship in authentic ways. Let’s Talk About It!
Hypertension and it's role of physiotherapy in it.Vishal kr Thakur
This particular slides consist of- what is hypertension,what are it's causes and it's effect on body, risk factors, symptoms,complications, diagnosis and role of physiotherapy in it.
This slide is very helpful for physiotherapy students and also for other medical and healthcare students.
Here is summary of hypertension -
Hypertension, also known as high blood pressure, is a serious medical condition that occurs when blood pressure in the body's arteries is consistently too high. Blood pressure is the force of blood pushing against the walls of blood vessels as the heart pumps it. Hypertension can increase the risk of heart disease, brain disease, kidney disease, and premature death.
2. INTRODUCTION:
As a result of activities of cells, lot of metabolic
wastes, i.e. unwanted by-products are formed. The
excess of these substances must be removed from
the body so as to maintain a proper homeostasis.
Excretion is thus defined as a process by which
metabolic wastes are removed from the body and an
osmotic balance is maintained.
The major waste products include: Nitrogenous
wastes like ammonia, urea, oxalate, creatinine &
uric acid.
3. INTRODUCTION:
The urinary system is one of the
excretory systems of the body. It
consists of the following structures
1) Two kidneys
2) Two ureters
3) One urinary bladder
4) One urethra
Nephrology is the scientific study of
anatomy, physiology & pathology of
the kidneys.
Branch of medicine that deals with
male & female urinary systems & male
reproductive system is called Urology.
4. Functions of Urinary system:
1) Kidneys regulate blood volume & composition;
help regulate blood pressure, pH, glucose level,
produce two hormone (calcitriol & erythropoietin)
& excrete waste in urine.
2) Ureter transport urine from kidney to urinary
bladder.
3) Urinary bladder stores urine and expels it into
urethra.
4) Urethra discharge urine from body.
5. KIDNEYS:
Gross Structure:
1) 2 kidney, each weight is 150 g in adults, located in
retroperitoneally in the lumbar region of
abdominal cavity on either side of vertebral
column.
2) Kidney is bean-shaped organs, approx. 10cm
long, 5cm wide & 2.5cm thick. The right kidney
is slightly lower than the left because of liver.
3) Vertical section of kidney shows:
Outer cortex- reddish in colour
6. KIDNEYS:
Gross Structure:
Inner medulla- pale in colour, it contains 10-15
renal pyramids which terminate medially in renal
papillae. Papillae projects into calyces. Such 10-15
minor calyces join to form two major calyces which
come out through pelvis of kidney to ureter.
4) The ureter exit from the hilus of the kidney &
pass to the bladder. The blood vessels, lymphatics
& nerves enter into or exit from the kidney via
hilus.
8. KIDNEYS:
Microscopic Structure:
The basic functional unit of kidney is Nephron. There
are approximately 1 to 1.3 million nephrons in each
kidney which drain into renal pelvis. Total length of
nephron ranges from 45 to 65 mm.
Partsof nephronare:
1) Bowman’s capsule
2) Glomerulus
3) Proximal convoluted tubule (PCT)
4) Loop of Henle
5) Distal convoluted tubule (DCT)
6) Collecting tubules.
9. KIDNEYS:
Microscopic Structure:
Nephron consist of 2 parts:
a) Renal corpuscle, where blood plasma is filtered.
b) Renal tubule, where filtered fluid passes.
1) Bowman’s capsule is the initial dilated part of the
nephron.
2) Glomerulus: It is formed by the invagination of a
tuft of capillaries into the Bowman’s capsule. The
capillaries are supplied by afferent arteriole & the
blood leaves from the tuft by efferent arteriole.
Bowman’s capsule & glomerulus together constitute
Malpighian corpuscle.
11. KIDNEYS:
Microscopic Structure:
Bowman’s capsule has two layers:
Visceral cell layer is very closely applied to the loop
capillaries so as to surround each loop on all sides. It is
continuous at the site of entrance of afferent & efferent
arterioles with parietal layer.
Parietal cell layer is applied to Bowman’s capsule &
forms the outer lining of the glomerulus. It is
continuous with the PCT.
A space is present between visceral and parietal layers
of the bowman’s capsule called Bowman’s space.
12. KIDNEYS:
Microscopic Structure:
Glomerular membrane: Glomerular
membrane is an extremely thin
membrane, each glomerulus contains six
lobules & each of these consists 3 to 6
capillary loops.
Arrangement of afferent & efferent
arterioles within glomerulus allows
maintenance of higher pressure (about 45
mmHg).
The major function of glomerular
membrane is to produce an ultrafiltrate,
i.e. the glomerular filtrate will contain all
the constituents of plasma except proteins.
13. KIDNEYS:
Microscopic Structure:
3) Proximal Convoluted Tubule: PCT lumen is
continuous with that of Bowman’s capsule. It consists
of singular layer of cells with curved outline & brush
border formed by numerous microvilli which
markedly increase the surface area for absorption.
4) Loop of Henle: It consist of descending limb which
arises in continuity with the terminal part of PCT.
Descending limb continues into the thick ascending
limb which is formed by low cuboidal epithelium.
5) Distal Convoluted Tubule: Thick ascending limb of
Henle is continued as DCT, this tubule come very
close to its own glomerulus & establishes close
proximity to the afferent & efferent arterioles of the
glomerulus.
14. KIDNEYS:
Microscopic Structure:
6) Collecting Tubules: DCT join to form collecting
tubules. It passes through the renal cortex & medulla
to empty into pelvis of the kidney.
The whole kidney is enveloped by a thin but tough
fibrous membrane called renal capsule. It limits the
swelling, if the kidney becomes oedematous.
17. FUNCTIONS OF KIDNEY:
The kidney perform the following main
functions:
a) Formation of urine
b) Regulation of water balance
c) Regulation of electrolyte balance
d) Maintenance of acid-base balance
e) Endocrine functions.
18. A. Formation of Urine:
As blood passes through the kidneys, the nephrons clear
the plasma of some substances e.g. urea, while
simultaneously retaining other essential substances such
as water. There are three linked mechanisms in the
formation of urine:
1) Substance to be excreted are removed by glomerular
filtrations & renal tubular secretion and passed into
the urine.
2) Substances that the body needs, e.g. Na+, HCO3- are
returned to the body by reabsorption processes.
19. Glomerular Filtration:
It is the initial step in urine formation. The plasma that
traverses the glomerular capillaries is filtered by highly
permeable glomerular membrane & the resultant fluid,
the glomerular filtrate, is passed into bowman’s
capsule.
Glomerular filtrate is called ultrafiltrate of plasma. It
practically contains no protein & no cells.
Glomerular Filtration Rate: It refers to the volume of
glomerular filtrate formed each minute by all nephron
in both the kidneys.
Normal Value: 125 mL/ minute= 170-180 L per day.
20. Glomerular Filtration:
Mechanism of Glomerular Filtration: For each
nephron, Effective (Net) filtration pressure is given as:
EFP = (Pcap- Pbow) - (COPcap-COPbow)
Where,
Pcap: Hydrostatic pressure in glomerular capillaries
= 45 mmHG
Pbow: Hydrostatic pressure in the Bowman’s capsule
= 10 mmHG
COPcap: Colloidal osmotic pressure of plasma in
glomerular capillaries= 25 mmHG.
COPbow: Colloidal osmotic pressure of filtrate in
bowman’s capsule. Normally it is zero.
21. Reabsorption & Secretion in
Renal Tubules:
The terms renal tubular secretion & renal tubular
reabsorption refer to the ‘direction of transport’. It is
the process by which composition & volume of
glomerular filtrate is changed during its passage
through the tubules.
i. Secretion refers to the transport of solutes from
peritubular capillaries into tubular lumen, i.e. it is the
addition of a substance to the filtrate.
ii. Reabsorption denotes the active transport of solutes
& the passive movement of water from tubular lumen
into peritubular capillaries, i.e. it is the removal of a
substance from the filtrate.
22. Reabsorption & Secretion in
Renal Tubules:
Renal tubular transport maximum (Tm): The renal
tubular maximum refers to the maximum amount of a
given solute that can be transported (reabsorbed or
secreted) per minute by the renal tubules.
Transport of individual substances in different
segments of the renal tubule:
i. The PCT reabsorbs 70% to 85% of the filtered Na+;
Cl-; HCO3
- & water; & almost 100% of the filtered
K+; HPO4
2- ; amino acids & glucose.
ii. Reabsorption of water is passive, while reabsorption
of solutes can be passive or active. Solute
reabsorption generates an osmotic gradient which
causes passive reabsorption of water (via osmosis).
23. Composition of Urine:
1) Colour: Pale yellow due to presence of pigments
(Urochrome & Urobilin).
2) Salts: Inorganic (Na+, K+, Ca2+ & phosphate),
Organic (Urea, uric acid & creatinine)
3) Volume: 1-2.5 L/day (average 1.5 L/day)
4) Specific gravity: 1.005-1.030
5) Reaction: pH ranges from 4.5 to 8 (average 6-6.5)
6) Microscopic examination (WBC, pus cells, hyaline
casts).
24. B. Regulation of Water Balance:
Since GFR is 125 mL/ minute, i.e. about 180 L/day of filtrate
is formed, whereas normal urine volume is 1- 1.5 L/day.
Thus, more than 99% of the filtrate (water) is normally
reabsorbed.
1) Reabsorption from PCT: Passive reabsorption of 75- 80%
of water occurs.
2) Reabsorption from Loop of Henle: In passing through the
Loop of Henle, another 5-10% of the filtered water is
removed.
3) Reabsorption in DCT & Collecting duct:
In the early part of DCT approx. 5-8% of filtered water is
removed passively, secondary to sodium reabsorption under
the influence of aldosterone.
In the terminal DCT & Collecting duct, ADH hormone
facilitates another 10-12% of water reabsorbed.
25. B. Regulation of Water Balance:
When ADH is present in high concentration, kidney
excrete small volume of concentrated urine, but volume
of urine cannot be less than 500 mL/ day because some
solute require water for their excretion called obligatory
volume of urine. This is the minimum urine volume
required to excrete the solutes, otherwise it will result
in accumulation of waste products in the body.
26. C. Regulation of Electrolyte Balance:
1) Kidney forms urine which varies widely in its solute
concentration according to the need of the body, e.g.
in overhydration, kidney can produce urine of 50
mosm/L (normal plasma osmol conc. Is 300 mosm/L)
& during dehydration kidneys can produce urine of
1200 mosm/L.
2) Kidney regulate the concentration of water &
electrolytes in blood. Thus it keeps the blood pressure
under control.
27. Renin-Angiotensin-Aldosterone System (RAAS):
1) When blood volume & blood pressure decreases,
walls of afferent arterioles are stretched less &
juxtaglomerular cells secrete enzyme renin into the
blood.
2) Renin clip off a 10- amino acid peptide called
angiotensin I from angiotensinogen, which is
synthesized by hepatocytes.
3) By clipping off two more amino acids, ACE converts
angiotensin I to angiotensin II, which is the active
form of the hormone.
Angiotensin II affects renal physiology in 3 ways:
28. 1) It decreases GFR causing
vasoconstriction of afferent
arterioles.
2) It enhances reabsorption of
Na+, Cl- & water in the PCT.
3) It stimulates the adrenal cortex
to release aldosterone, it
stimulates cells in collecting
duct to reabsorb more Na+, Cl,
which causes increase in blood
volume & blood pressure.
Renin-Angiotensin-Aldosterone System (RAAS):
29. D. Regulation of Acid- Base Balance:
1) Kidneys are responsible for clearing the body
metabolically produced H+.
2) For all electrical neutrality of body fluids excretion of
excess anion in urine is very important, this situation
is prevented due to manufacture of two important
cations, H+ & NH4+.
3) Major sites of urine acidification are DCT &
Collecting tubules.
4) Three important reactions (buffer systems) in tubular
fluid that remove free H+:
Bicarbonate system
Dibasic phosphate system
Ammonia system
30. E. Endocrine Function:
Kidneys are endocrine organs which secrete:
1) Renin: Renin is a major component of the renin-
angiotensin-aldosterone mechanism & is useful to
regulate blood pressure.
2) Renal erythropoietic factor (REF, Erythropoietin) it
increases the number of circulating erythrocytes.
3) 1,25 DHCC (Dihydrocholecalciferol).
31. URETERS:
Urinary passages include renal calyces & pelvis,
ureter, urinary bladder & urethra, the urine
produced by the nephrons continuously trickles
from the renal papillae into the calyces & the
papillae which extends through the hilum to
continue as the ureter.
1) Ureters are 25 to 30 cm long tubes with a
diameter of 3 mm, extend from hilum to
urinary bladder.
2) They are located retroperitoneally but at the
level of sacral bone, they pass obliquely
through the posterior wall of urinary bladder
to open up into its bottom.
3) Function: ureters convey urine from the
kidneys to the urinary bladder by peristaltic
contractions of the smooth muscular wall.
32. URINARY BLADDER:
1) Urinary bladder is mainly a smooth muscle
hollow vesicle & is composed of following:
i. The body comprises detrusor muscle.
ii. The trigone, a small triangular area near the
mouth of urinary bladder, through which both
ureters & urethra pass.
iii. Internal sphincter: The trigone muscle fibres
get interlaced around the opening of urethra
forming internal sphincter. Its main function
is to maintain tonic closure of the urethral
opening.
iv. External sphincter: It is a voluntary skeletal
muscle. Normally this sphincter remains
tonically contracted which prevents constant
dribbling of urine.
33. URINARY BLADDER:
v. Urinary bladder wall is made
of many layers, including:
Urothelium or transitional
epithelium
Lamina propria, its connective
tissue
Detrusor muscle, present
outside the lamina propria
Fatty connective tissue, it
present outside of bladder &
separates it from other organs.
34. URINARY BLADDER:
2) Physiological capacity of urinary bladder varies with age:
At birth – 20-50 ml
At 1 year – 200 ml
Adults – 600 ml
3) Urine stored in the bladder remains unchanged in the
chemical composition.
4) Urinary bladder is innervated by efferent & afferent nerves,
it indicate degree of distention & convey pain sensibility.
5) Micturition reflex: As the urinary bladder fills with urine,
the wall stretches, impulses are initiated by stretch
receptors in the bladder wall causing sensory signal
through parasympathetic & sympathetic nerve, this whole
constitute the micturition reflex.
35. URINARY BLADDER:
6) Mechanism of voluntary micturition:
i. In response to desire to micturate, urinary bladder can
be voluntarily emptied. Impulses from cerebral cortex
motor area pass down to sacral segment causing
stimulation of parasympathetic fibres. Then impulse
pass to cause contraction of body of urinary bladder
wall & relaxation of trigone & internal sphincter, this
finally result in emptying of bladder.
ii. First urge to pass urine is felt at urinary bladder
volume of approx. 150 ml.
iii. A marked sense of fullness or discomfort is felt at
about 400 ml, which normally results in initiation of
micturition reflex.
36. URINARY BLADDER:
iv. If inconvenient to micturate or desire to hold urine,
impulses from cerebral cortex relaxes the detrusor
muscle.
v. By constant practice urinary bladder can be trained
to accommodate very large volume of urine before
uncontrollable & unbearable rise of intra- vesicle
pressure occurs.