Kidney function and nephrons
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URINE FORMATION
Each kidney contains over 1 million tiny structures called nephrons. Each nephron has a glomerulus, the site of blood filtration. The glomerulus is a network of capillaries surrounded by a cuplike structure, the glomerular capsule (or Bowman’s capsule). As blood flows through the glomerulus, blood pressure pushes water and solutes from the capillaries into the capsule through a filtration membrane. This glomerular filtration begins the urine formation process.Inside the glomerulus, blood pressure pushes fluid from capillaries into the glomerular capsule through a specialized layer of cells. This layer, the filtration membrane, allows water and small solutes to pass but blocks blood cells and large proteins. Those components remain in the bloodstream. The filtrate (the fluid that has passed through the membrane) flows from the glomerular capsule further into the nephron.The glomerulus filters water and small solutes out of the bloodstream. The resulting filtrate contains waste, but also other substances the body needs: essential ions, glucose, amino acids, and smaller proteins. When the filtrate exits the glomerulus, it flows into a duct in the nephron called the renal tubule. As it moves, the needed substances and some water are reabsorbed through the tube wall into adjacent capillaries. This reabsorption of vital nutrients from the filtrate is the second step in urine creation.The filtrate absorbed in the glomerulus flows through the renal tubule, where nutrients and water are reabsorbed into capillaries. At the same time, waste ions and hydrogen ions pass from the capillaries into the renal tubule. This process is called secretion. The secreted ions combine with the remaining filtrate and become urine. The urine flows out of the nephron tubule into a collecting duct. It passes out of the kidney through the renal pelvis, into the ureter, and down to the bladder.The nephrons of the kidneys process blood and create urine through a process of filtration, reabsorption, and secretion. Urine is about 95% water and 5% waste products. Nitrogenous wastes excreted in urine include urea, creatinine, ammonia, and uric acid. Ions such as sodium, potassium, hydrogen, and calcium are also excreted
Human kidney,structure and functions of kidney
human kidney structural and functions.different types of structural components present in kidney and each structure having definite functions.structural and functional aspects of kidney.
Nephron (The Guyton and Hall physiology)
Structural and Functional unit of kidney is called nephron.
There are about 1.3 million nephron in each kidney.
New nephrons can not be regenerated by kidneys.
Functioning nephrons decrease about 10 % every 10 years at the age of 40.
At the age of 80, there are 40 % of functioning nephrons as compared to 40 yrs.
It is formed by two parts.
1. GLOMERULUS
2. BOWMAN’S CAPSULE
1- Glomerulus:
It consists of tuft of glomerular capillaries.
There is anastomosing & branching network of glomerular capillaries.
Glomerular capillaries have high hydrostatic pressure (nearly 60 mm Hg) as compared with other capillaries.
Glomerulus is surrounded by a membranous cover called Bowman’s capsule.
Each glomerulus is about 0.2 mm in diameter.
Glomerulus and Bowman’s capsule together constitute renal corpuscle.
Each renal tubule is divided into various part as they have different functions.
i- Proximal convulated tubule.
It is continuation of Bowman’s capsule.
ii- Loop of Henle. It is continuation of prox. conv. tubule.
* Loop of Henle has three parts.
a- descending limb,
b- u turn or bend in medulla and
c- ascending limb.
Ascending limb has initial thin segment followed by thick segment.
At the end of thick ascending limb, there is short segment called macula densa, which plays important role in controlling functions of nephron.
Absorption of digested food
Dr. K. Rama Rao
Department of Zoology
Govt, Degree College
TEKKALI; Srikakulam Dt: A.P.
Recommended
URINE FORMATION
Each kidney contains over 1 million tiny structures called nephrons. Each nephron has a glomerulus, the site of blood filtration. The glomerulus is a network of capillaries surrounded by a cuplike structure, the glomerular capsule (or Bowman’s capsule). As blood flows through the glomerulus, blood pressure pushes water and solutes from the capillaries into the capsule through a filtration membrane. This glomerular filtration begins the urine formation process.Inside the glomerulus, blood pressure pushes fluid from capillaries into the glomerular capsule through a specialized layer of cells. This layer, the filtration membrane, allows water and small solutes to pass but blocks blood cells and large proteins. Those components remain in the bloodstream. The filtrate (the fluid that has passed through the membrane) flows from the glomerular capsule further into the nephron.The glomerulus filters water and small solutes out of the bloodstream. The resulting filtrate contains waste, but also other substances the body needs: essential ions, glucose, amino acids, and smaller proteins. When the filtrate exits the glomerulus, it flows into a duct in the nephron called the renal tubule. As it moves, the needed substances and some water are reabsorbed through the tube wall into adjacent capillaries. This reabsorption of vital nutrients from the filtrate is the second step in urine creation.The filtrate absorbed in the glomerulus flows through the renal tubule, where nutrients and water are reabsorbed into capillaries. At the same time, waste ions and hydrogen ions pass from the capillaries into the renal tubule. This process is called secretion. The secreted ions combine with the remaining filtrate and become urine. The urine flows out of the nephron tubule into a collecting duct. It passes out of the kidney through the renal pelvis, into the ureter, and down to the bladder.The nephrons of the kidneys process blood and create urine through a process of filtration, reabsorption, and secretion. Urine is about 95% water and 5% waste products. Nitrogenous wastes excreted in urine include urea, creatinine, ammonia, and uric acid. Ions such as sodium, potassium, hydrogen, and calcium are also excreted
Human kidney,structure and functions of kidney
human kidney structural and functions.different types of structural components present in kidney and each structure having definite functions.structural and functional aspects of kidney.
Nephron (The Guyton and Hall physiology)
Structural and Functional unit of kidney is called nephron.
There are about 1.3 million nephron in each kidney.
New nephrons can not be regenerated by kidneys.
Functioning nephrons decrease about 10 % every 10 years at the age of 40.
At the age of 80, there are 40 % of functioning nephrons as compared to 40 yrs.
It is formed by two parts.
1. GLOMERULUS
2. BOWMAN’S CAPSULE
1- Glomerulus:
It consists of tuft of glomerular capillaries.
There is anastomosing & branching network of glomerular capillaries.
Glomerular capillaries have high hydrostatic pressure (nearly 60 mm Hg) as compared with other capillaries.
Glomerulus is surrounded by a membranous cover called Bowman’s capsule.
Each glomerulus is about 0.2 mm in diameter.
Glomerulus and Bowman’s capsule together constitute renal corpuscle.
Each renal tubule is divided into various part as they have different functions.
i- Proximal convulated tubule.
It is continuation of Bowman’s capsule.
ii- Loop of Henle. It is continuation of prox. conv. tubule.
* Loop of Henle has three parts.
a- descending limb,
b- u turn or bend in medulla and
c- ascending limb.
Ascending limb has initial thin segment followed by thick segment.
At the end of thick ascending limb, there is short segment called macula densa, which plays important role in controlling functions of nephron.
Absorption of digested food
Dr. K. Rama Rao
Department of Zoology
Govt, Degree College
TEKKALI; Srikakulam Dt: A.P.
Nephron anatomy
Renal corpuscleGlomerulusBowman’s capsule
Renal tubuleProximal convoluted tubule (PCT)
To Bowman’s capsule:Water Amino acidsGlucoseUreaNa, K, ClHormonesVitamins
Filtration ~ 180 liters filtered out/dayReabsorption ~ 179 liters returned to the blood/day~ 1 liter excreted as urine/day (0.78 mL/min)
Autoregulation of Glomerular Filtration Rate
The basics of autoregulation of Gloemrular filtration rate. This ppt deals with basic renal physiology, tubuloglomerular feedback, myogenic reflex, juxtaglomerular apparatus and renin angiotensin aldosterone system in brief. P.S.- The ppt has animations so kindly view in slide/presentation mode
Urine formation
Dr. K. Rama Rao
Department of Zoology
Govt, Degree College
TEKKALI; Srikakulam Dt: A.P.
Phone: 9010705687
Tubular reabsorption (The Guyton and Hall physiology)
It is the second step of urine formation.
It is defined as;
“ The process by which water and other substances are transported by renal tubules back to blood is called Tubular Reabsorption”.
Tubular reabsorption is highly selective.
Some substances like glucose and amino acids are completely absorbed from tubules. So, the urinary excretion is zero.
Ions such as Na+, Cl-, HCO3- are highly absorbed but rate of absorption and excretion varies, according to body needs.
Materials Not Reabsorbed
Nitrogenous waste products
Urea
Uric acid
Creatinine
Excess water
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- Visit our website for more lectures: www.NephroTube.com
- Subscribe to our YouTube channel: www.youtube.com/NephroTube
- Join our facebook group: www.facebook.com/groups/NephroTube
- Like our facebook page: www.facebook.com/NephroTube
- Follow us on twitter: www.twitter.com/NephroTube
Physiology of excretion. Kidney functions. Urine Formation
Physiology of excretion. Kidney functions. Urine Formation
Parts, structure and functions of nephron
The nephron is the microscopic structural and functional unit of the kidney. It is composed of a renal corpuscle and a renal tubule. The renal corpuscle consists of a tuft of capillaries called a glomerulus and an encompassing Bowman's capsule. The renal tubule extends from the capsule.
Mechanism of Hormone Action
This presentation deals with the different mechanisms whereby hormones act to target cells/tissues,
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Nephron anatomy
Renal corpuscleGlomerulusBowman’s capsule
Renal tubuleProximal convoluted tubule (PCT)
To Bowman’s capsule:Water Amino acidsGlucoseUreaNa, K, ClHormonesVitamins
Filtration ~ 180 liters filtered out/dayReabsorption ~ 179 liters returned to the blood/day~ 1 liter excreted as urine/day (0.78 mL/min)
Autoregulation of Glomerular Filtration Rate
The basics of autoregulation of Gloemrular filtration rate. This ppt deals with basic renal physiology, tubuloglomerular feedback, myogenic reflex, juxtaglomerular apparatus and renin angiotensin aldosterone system in brief. P.S.- The ppt has animations so kindly view in slide/presentation mode
Urine formation
Dr. K. Rama Rao
Department of Zoology
Govt, Degree College
TEKKALI; Srikakulam Dt: A.P.
Phone: 9010705687
Tubular reabsorption (The Guyton and Hall physiology)
It is the second step of urine formation.
It is defined as;
“ The process by which water and other substances are transported by renal tubules back to blood is called Tubular Reabsorption”.
Tubular reabsorption is highly selective.
Some substances like glucose and amino acids are completely absorbed from tubules. So, the urinary excretion is zero.
Ions such as Na+, Cl-, HCO3- are highly absorbed but rate of absorption and excretion varies, according to body needs.
Materials Not Reabsorbed
Nitrogenous waste products
Urea
Uric acid
Creatinine
Excess water
GLOMERULAR FILTRATION /TUBULAR REABSORPTION AND SECRETION
GLOMERULAR FILTRATION /TUBULAR REABSORPTION AND SECRETION
Renal Physiology (III) - Renal Tubular Processing - Dr. Gawad
- Visit our website for more lectures: www.NephroTube.com
- Subscribe to our YouTube channel: www.youtube.com/NephroTube
- Join our facebook group: www.facebook.com/groups/NephroTube
- Like our facebook page: www.facebook.com/NephroTube
- Follow us on twitter: www.twitter.com/NephroTube
Physiology of excretion. Kidney functions. Urine Formation
Physiology of excretion. Kidney functions. Urine Formation
Parts, structure and functions of nephron
The nephron is the microscopic structural and functional unit of the kidney. It is composed of a renal corpuscle and a renal tubule. The renal corpuscle consists of a tuft of capillaries called a glomerulus and an encompassing Bowman's capsule. The renal tubule extends from the capsule.
Mechanism of Hormone Action
This presentation deals with the different mechanisms whereby hormones act to target cells/tissues,
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Tubular reabsorption (The Guyton and Hall physiology)
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Physiology of excretion. Kidney functions. Urine Formation
Physiology of excretion. Kidney functions. Urine Formation
Similar to Kidney function and nephrons
AnswerKidneys are the functional units of renal system of rom uri.pdf
Answer:
Kidneys are the functional units of renal system of rom urine and it is essential to maintain
homeostasis. Blood is going to enter into the kidney through renal arteries followed by entry of
afferent arterioles into the \"glomerulus of nephrons\" & leave the filtrate (according to
concentration gradient) finally exists as efferent arteriole
Kidneys are the major organs of urinary system. The filtration of blood takes place in the kidneys
through the nephrons. Two ureters carry the urine from the kidneys to the urinary bladder. From
the bladder, urine is excreted out through the urethra. Relatable analogy is presence of \"similar
ureters\" and two bean shaped kidenys with nephrons
The different stages in glomerular filtration or urine formation are.
Filtration: The movement of water and solutes from the plasma into the renal tubules is known as
filtration. The major driving force of the filtration is hydrostatic pressure in the glomerulus
capillaries.
Blood passes through the capillaries in the glomerulus, due to the hydrostatic pressure in the
Bowman’s capsule, plasma is filtered into the Bowman\'s capsule except blood proteins (this is
called ultra-filtration). This filtrate is called glomerular filtrate. Hydrostatic pressure is the
pressure exerted by the filtrate in Bowman\'s capsule (15 mm Hg).
Absorption (or reabsorption):
It is the movement of water and solutes from the renal tubule into the plasma. The process of
absorption mostly occurs in the proximal tubules (approximately 70% of the filtrate is
reabsorbed from the proximal tubules). The process of reabsorption is driven by hydrostatic and
oncotic pressure, which is strictly under hormonal regulation.
Oncotic pressure is the pressure exerted by the blood proteins, which draws water in to the
circulation.
Secretion:
Tubular reabsorption of water and other substances back to the blood occur while the glomerular
filtrate passes through the tubular portion of nephron. About 99% of water and electrolytes are
reabsorbed during this process by both active and passive reabsorption process. During tubular
secretion, substances pass from the blood into renal tubules.
Excretion:
Urine from the renal tubules enter into the collecting duct à Papillary duct à Calyx à Renal pelvis
à Ureters à Urinary bladder à Urethra (excreted out of the body.).
Normal glomerular filtration rate in the Bowman’s capsule is from 90 to 120 ml / min/1.73 m2.
Usually older people do have a bit lower normal GFR levels as it is naturally reduce with age.
Given GFR is 35mL/min/1.73 m2 (moderate decrease), it tells about the patient’s kidney
function that “a sign of chronic kidney disease” because of diabetes, high blood pressure
followed by glomerulonephritis. It is better control blood pressure by hormonal release.
The three stages of urine formation are 1. Filtration; 2. Tubular reabsorption & secretion; 3.
Water conservation
Glomerular filtration (GFR):
The formation of urine includes
1. Glomerular filtration
.
AnswerKidneys are the functional units of renal system of rom uri.pdf
Answer:
Kidneys are the functional units of renal system of rom urine and it is essential to maintain
homeostasis. Blood is going to enter into the kidney through renal arteries followed by entry of
afferent arterioles into the \"glomerulus of nephrons\" & leave the filtrate (according to
concentration gradient) finally exists as efferent arteriole
Kidneys are the major organs of urinary system. The filtration of blood takes place in the kidneys
through the nephrons. Two ureters carry the urine from the kidneys to the urinary bladder. From
the bladder, urine is excreted out through the urethra. Relatable analogy is presence of \"similar
ureters\" and two bean shaped kidenys with nephrons
The different stages in glomerular filtration or urine formation are.
Filtration: The movement of water and solutes from the plasma into the renal tubules is known as
filtration. The major driving force of the filtration is hydrostatic pressure in the glomerulus
capillaries.
Blood passes through the capillaries in the glomerulus, due to the hydrostatic pressure in the
Bowman’s capsule, plasma is filtered into the Bowman\'s capsule except blood proteins (this is
called ultra-filtration). This filtrate is called glomerular filtrate. Hydrostatic pressure is the
pressure exerted by the filtrate in Bowman\'s capsule (15 mm Hg).
Absorption (or reabsorption):
It is the movement of water and solutes from the renal tubule into the plasma. The process of
absorption mostly occurs in the proximal tubules (approximately 70% of the filtrate is
reabsorbed from the proximal tubules). The process of reabsorption is driven by hydrostatic and
oncotic pressure, which is strictly under hormonal regulation.
Oncotic pressure is the pressure exerted by the blood proteins, which draws water in to the
circulation.
Secretion:
Tubular reabsorption of water and other substances back to the blood occur while the glomerular
filtrate passes through the tubular portion of nephron. About 99% of water and electrolytes are
reabsorbed during this process by both active and passive reabsorption process. During tubular
secretion, substances pass from the blood into renal tubules.
Excretion:
Urine from the renal tubules enter into the collecting duct à Papillary duct à Calyx à Renal pelvis
à Ureters à Urinary bladder à Urethra (excreted out of the body.).
Normal glomerular filtration rate in the Bowman’s capsule is from 90 to 120 ml / min/1.73 m2.
Usually older people do have a bit lower normal GFR levels as it is naturally reduce with age.
Given GFR is 35mL/min/1.73 m2 (moderate decrease), it tells about the patient’s kidney
function that “a sign of chronic kidney disease” because of diabetes, high blood pressure
followed by glomerulonephritis. It is better control blood pressure by hormonal release.
The three stages of urine formation are 1. Filtration; 2. Tubular reabsorption & secretion; 3.
Water conservation
Glomerular filtration (GFR):
The formation of urine includes
1. Glomerular filtration
.
Similar to Kidney function and nephrons (20)
AnswerKidneys are the functional units of renal system of rom uri.pdf
AnswerKidneys are the functional units of renal system of rom uri.pdf
AnswerKidneys are the functional units of renal system of rom uri.pdf
AnswerKidneys are the functional units of renal system of rom uri.pdf
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