The respiratory system functions to oxygenate tissues and remove carbon dioxide through gas exchange. It consists of the upper respiratory tract including the nose and pharynx, and the lower respiratory tract including the larynx, trachea, bronchi, bronchioles and alveoli in the lungs. Oxygen diffuses into the blood in the alveoli while carbon dioxide diffuses out. Breathing is controlled by respiratory centers in the brain and involves inspiration through contraction of the diaphragm and expiration through relaxation.
The respiratory system consists of an upper respiratory tract and lower respiratory tract. The upper tract includes the nose, nasal cavity, paranasal sinuses, and pharynx. The lower tract includes the larynx, trachea, bronchi, and lungs. The nose warms, moistens, and filters air and contains smell receptors. The lungs contain alveoli where gas exchange occurs between air in alveoli and blood in capillaries. Breathing involves inhalation that draws air into the lungs and exhalation that forces air out.
The document describes the anatomy and physiology of the respiratory system. It discusses the structures of the respiratory system including the upper and lower airways, pleura, lungs, thorax, diaphragm and respiratory centers. It also describes the processes of respiration including ventilation, diffusion, and gas exchange. Furthermore, it outlines how to assess a client with a respiratory disorder through obtaining history, performing a physical exam including inspection, palpation, percussion and auscultation of breath sounds.
This document provides an overview of the basic anatomy and functions of the respiratory system. It describes the major components including the upper respiratory tract (nose, nasal cavity, paranasal sinuses, pharynx), lower respiratory tract (larynx, trachea, bronchi, lungs), respiratory muscles (diaphragm, intercostals), and pleural cavities. The respiratory system functions to warm and filter air, facilitate gas exchange in the lungs, and maintain homeostasis through the coordinated actions of these anatomical structures.
The respiratory system provides oxygen to the body's cells and removes carbon dioxide. It includes the nose, pharynx, larynx, trachea, bronchi and lungs. The nose warms, filters and humidifies inhaled air and is also the organ of smell. The pharynx is a passageway for air and food that is lined with lymphoid tissue including the tonsils. The larynx, or voice box, contains cartilages including the thyroid and cricoid cartilages which support the vocal cords that produce sound.
The respiratory system functions to oxygenate the blood and remove carbon dioxide through gas exchange that occurs in the alveoli of the lungs. It is organized into an upper respiratory tract including the nose and pharynx, and a lower respiratory tract including the larynx, trachea, bronchi, and lungs. The lungs are paired organs located in the thoracic cavity that contain alveoli which are the sites of gas exchange between the respiratory and circulatory systems.
This document discusses the human respiratory system and the process of respiration. It describes the major organs of the respiratory system, including the nose, pharynx, larynx, trachea, bronchi, bronchioles and alveoli. It explains that the respiratory system allows for the intake of oxygen and removal of carbon dioxide. The document outlines the two phases of breathing - inspiration and expiration. It also discusses gas exchange that occurs between the blood and alveoli, and lists some common malfunctions and diseases of the respiratory system like asthma, bronchitis, emphysema and pneumonia.
Anatomy/Physiology Slideshow: The Respiratory SystemLHSprincipal
The respiratory system brings air into the body during breathing. It includes the nose, throat, trachea, and lungs. In the lungs, oxygen from the air is transferred to the bloodstream and distributed to cells throughout the body. The respiratory system has several parts - air enters through the nose and passes through the pharynx and larynx before reaching the trachea. The trachea divides into bronchi that lead into the lungs and branch into smaller bronchioles and alveoli, where oxygen and carbon dioxide are exchanged between the blood and air.
The respiratory system allows for gas exchange in the body. It begins with the nostrils, where air enters and exits the nasal cavity to be warmed. The pharynx and larynx allow air to pass to the trachea and then bronchi, where air flows into the lungs. The lungs, located in the chest, have lobes and facilitate breathing, respiration, and protection from infection. Inhalation draws oxygen into the lungs through muscle contraction and exhalation removes carbon dioxide as a waste product.
The respiratory system consists of an upper respiratory tract and lower respiratory tract. The upper tract includes the nose, nasal cavity, paranasal sinuses, and pharynx. The lower tract includes the larynx, trachea, bronchi, and lungs. The nose warms, moistens, and filters air and contains smell receptors. The lungs contain alveoli where gas exchange occurs between air in alveoli and blood in capillaries. Breathing involves inhalation that draws air into the lungs and exhalation that forces air out.
The document describes the anatomy and physiology of the respiratory system. It discusses the structures of the respiratory system including the upper and lower airways, pleura, lungs, thorax, diaphragm and respiratory centers. It also describes the processes of respiration including ventilation, diffusion, and gas exchange. Furthermore, it outlines how to assess a client with a respiratory disorder through obtaining history, performing a physical exam including inspection, palpation, percussion and auscultation of breath sounds.
This document provides an overview of the basic anatomy and functions of the respiratory system. It describes the major components including the upper respiratory tract (nose, nasal cavity, paranasal sinuses, pharynx), lower respiratory tract (larynx, trachea, bronchi, lungs), respiratory muscles (diaphragm, intercostals), and pleural cavities. The respiratory system functions to warm and filter air, facilitate gas exchange in the lungs, and maintain homeostasis through the coordinated actions of these anatomical structures.
The respiratory system provides oxygen to the body's cells and removes carbon dioxide. It includes the nose, pharynx, larynx, trachea, bronchi and lungs. The nose warms, filters and humidifies inhaled air and is also the organ of smell. The pharynx is a passageway for air and food that is lined with lymphoid tissue including the tonsils. The larynx, or voice box, contains cartilages including the thyroid and cricoid cartilages which support the vocal cords that produce sound.
The respiratory system functions to oxygenate the blood and remove carbon dioxide through gas exchange that occurs in the alveoli of the lungs. It is organized into an upper respiratory tract including the nose and pharynx, and a lower respiratory tract including the larynx, trachea, bronchi, and lungs. The lungs are paired organs located in the thoracic cavity that contain alveoli which are the sites of gas exchange between the respiratory and circulatory systems.
This document discusses the human respiratory system and the process of respiration. It describes the major organs of the respiratory system, including the nose, pharynx, larynx, trachea, bronchi, bronchioles and alveoli. It explains that the respiratory system allows for the intake of oxygen and removal of carbon dioxide. The document outlines the two phases of breathing - inspiration and expiration. It also discusses gas exchange that occurs between the blood and alveoli, and lists some common malfunctions and diseases of the respiratory system like asthma, bronchitis, emphysema and pneumonia.
Anatomy/Physiology Slideshow: The Respiratory SystemLHSprincipal
The respiratory system brings air into the body during breathing. It includes the nose, throat, trachea, and lungs. In the lungs, oxygen from the air is transferred to the bloodstream and distributed to cells throughout the body. The respiratory system has several parts - air enters through the nose and passes through the pharynx and larynx before reaching the trachea. The trachea divides into bronchi that lead into the lungs and branch into smaller bronchioles and alveoli, where oxygen and carbon dioxide are exchanged between the blood and air.
The respiratory system allows for gas exchange in the body. It begins with the nostrils, where air enters and exits the nasal cavity to be warmed. The pharynx and larynx allow air to pass to the trachea and then bronchi, where air flows into the lungs. The lungs, located in the chest, have lobes and facilitate breathing, respiration, and protection from infection. Inhalation draws oxygen into the lungs through muscle contraction and exhalation removes carbon dioxide as a waste product.
The document summarizes the key stages and processes of respiration. It discusses:
1) The four main stages of respiration: ventilation, diffusion, transportation of oxygen and carbon dioxide, and gas exchange in tissues and blood.
2) Non-respiratory functions of breathing like moistening air, maintaining pH, and vocalization.
3) How the pleura and pressure gradients enable the lungs to expand and contract during breathing.
4) Major respiratory muscles and how their movement affects rib and sternum movement during inhalation and exhalation.
This PPT covers Anatomy and Physiology of respiratory system. Anatomy of respiratory organs, Mechanism of respiration, Internal Respiration, external respiration, Transport of oxygen in blood, Transport of carbon dioxide in blood, Regulation of respiration, lung volume and lung capacities are explained.
This document discusses physiology of respiration, including lung volumes and capacities, the muscles involved in breathing, pulmonary ventilation, gas exchange, and transport of oxygen and carbon dioxide in the blood. It covers topics like tidal volume, minute ventilation, alveolar ventilation rate, the partial pressures of oxygen and carbon dioxide in inhaled and exhaled air, and how diffusion and Henry's law govern gas exchange between the alveoli and blood in the pulmonary capillaries.
The respiratory system exchanges gases through a series of organs. The document describes the key parts and functions of the respiratory system. It focuses on the nose, which warms, moistens, and filters air before it reaches the lungs. It then describes the pharynx and larynx, which continue guiding air through the upper respiratory tract. The larynx contains cartilages like the thyroid and cricoid that support vocal cord function and air passage.
The respiratory system brings air into the lungs, exchanges oxygen and carbon dioxide between the air sacs and bloodstream, and exhales air. It includes the nasal cavity, pharynx, larynx, trachea, bronchial tubes, and lungs. The nasal cavity cleans and conditions air before it reaches the pharynx and larynx, which direct air to the trachea and lungs for gas exchange to occur in the alveoli.
The respiratory system allows for the exchange of gases in the body. It includes the nose, mouth, throat, trachea, bronchi, lungs, diaphragm and alveoli. The lungs and alveoli work to exchange oxygen and carbon dioxide between the air and blood. Common respiratory disorders include asthma, bronchitis, emphysema and pneumonia which can involve inflammation or infection of the lungs, bronchi or alveoli.
Respiratory system, physiology of respiratory system and neural control sunil JMI
The respiratory system includes the nose, pharynx, larynx, trachea, bronchi, and lungs. Gas exchange occurs in the alveoli of the lungs where oxygen enters the blood and carbon dioxide leaves. Inspiration is an active process involving contraction of the diaphragm and intercostal muscles which increases the thoracic cavity volume. Expiration is usually a passive process involving relaxation of these muscles and elastic recoil of the lungs. The respiratory centers in the medulla control breathing rhythm and depth via nervous and chemical feedback mechanisms.
The respiratory system has three main functions: gas exchange between the atmosphere and blood, filtering and warming of inspired air, and sound production. It has three basic steps: pulmonary ventilation (breathing), external (pulmonary) respiration involving gas exchange in the lungs, and internal (tissue) respiration involving gas exchange in tissues. Inspiration is an active process using inspiratory muscles like the diaphragm and external intercostals to expand the thoracic cavity and lower lung pressure, allowing air to flow in. Expiration is usually a passive process involving elastic recoil of the lungs and chest wall. Other factors like alveolar surface tension, lung compliance, and airway resistance also influence ventilation.
The human respiratory system consists of the upper and lower respiratory tract. The upper tract includes the nose, nasal cavity, sinuses, pharynx and larynx. The lower tract includes the trachea, bronchi, bronchioles and lungs. The nose warms and filters inhaled air. The lungs are the primary organs for gas exchange, extracting oxygen from inhaled air into the bloodstream and releasing carbon dioxide from the bloodstream. Respiration is controlled by respiratory centers in the brainstem which regulate the muscles of breathing.
These slides will help you know about the physiology of the respiratory system. These slides are the simplest version on how to know about the Physiology Of Respiratory System with its applied physiology.
The respiratory system controls breathing by bringing oxygen into the body through the nose and mouth. Air enters the nasal cavity, where it is warmed and filtered before reaching the pharynx and larynx. The larynx contains the vocal cords and epiglottis, which prevent food from entering the trachea. The trachea divides into bronchi that lead into the lungs, where oxygen diffuses into blood vessels in the alveoli and carbon dioxide diffuses out. Breathing is driven by contractions of the diaphragm during inhalation and its relaxation during exhalation.
Anatomy and physiology RESPIRATORY system Ayman Nasr
The document provides an overview of the anatomy and physiology of the respiratory system. It describes the major structures involved, including the nose, pharynx, larynx, trachea, bronchi, lungs and pleurae. It explains the functions of these structures like warming, filtering and humidifying air in the nose, routing air and food in the larynx, and gas exchange in the alveoli. Additionally, it covers topics like breathing mechanics, pulmonary circulation, and assessment of the respiratory system.
The respiratory system consists of an upper respiratory tract and lower respiratory tract. The upper tract includes the nose, pharynx and larynx, and conducts air. The lower tract includes the trachea, bronchi and lungs, and is where gas exchange occurs in the alveoli. Breathing involves inspiration and expiration through cyclic contraction and relaxation of the diaphragm and intercostal muscles. The lungs and pleural membranes allow for efficient gas exchange through a vast surface area in the alveoli.
The respiratory system allows for gas exchange between the lungs and cells of the body. It includes the nose, pharynx, larynx, trachea, bronchi, bronchioles, lungs and alveoli. The nose and pharynx warm and humidify inhaled air before it reaches the lungs. In the lungs, oxygen passes from the alveoli into the bloodstream and carbon dioxide passes out. This allows for cellular respiration to occur.
This document discusses the anatomy and physiology of the respiratory system. It describes the structure and function of the upper airways including the nose, sinuses, and larynx. It then covers the lower airways including the trachea, bronchi, bronchioles, and respiratory units containing the alveoli. It also discusses gas exchange, blood supply, innervation, and control of respiration.
The respiratory system is the network of organs and tissues that help you breathe. It includes your airways, lungs, and blood vessels. The muscles that power your lungs are also part of the respiratory system. These parts work together to move oxygen throughout the body and clean out waste gases like carbon dioxide.
The document describes the structure and function of the respiratory system. It discusses the upper and lower respiratory tract, which are divided into conducting and respiratory portions. The upper tract includes the nose, nasal cavity, sinuses, pharynx and larynx. The lower tract includes the trachea, bronchi and bronchioles which branch into millions of alveoli in the lungs where gas exchange occurs. The document also outlines the processes of breathing, gas exchange, and the roles of various respiratory structures.
In humans, the respiratory tract is the part of the anatomy of the respiratory system involved with the process of respiration. Air is breathed in through the nose or the mouth. In the nasal cavity, a layer of mucous membrane acts as a filter and traps pollutants and other harmful substances found in the air.
Respiration Process which involves taking in oxygen into the cells, using it for releasing energy by burning food and then eliminating the waste products like carbon dioxide and water from the body It is a catabolic process as the food is broken down into simpler form. In short, respiration is a biochemical activity taking place with in the protoplasm of the cell and results in the liberation of energy
2. Breathing and Respiration BREATHING 1. Mechanism by which organisms obtain oxygen from the air and release carbon dioxide 2. It is a physical process 3. It involves lungs of the organism RESPIRATION 1. It includes breathing and oxidation of food in the cells of the organism to release energy 2. It is a biochemical process 3. It involves the mitochondria in the cells where food is oxidized to release energy
The document summarizes the structure and function of the respiratory system. It describes the conducting portion which includes the nasal cavities, pharynx, larynx, trachea, bronchi and bronchioles that warm, humidify and clean the air, but do not involve gas exchange. The respiratory portion includes respiratory bronchioles and alveoli where gas exchange occurs between the blood and air. It then provides detailed descriptions of the trachea, lungs, alveoli, alveolar epithelium consisting of Type-1 and Type-2 pneumocytes, blood-air barrier, interalveolar septum and alveolar phagocytes.
The respiratory system consists of an upper and lower airway. The upper airway includes the nose, which warms, filters, and humidifies air, and the pharynx. The lower airway includes the larynx, trachea, bronchi, and lungs. The lungs contain millions of alveoli where gas exchange occurs between inhaled air and blood via thin epithelial walls. Oxygen diffuses into the blood and carbon dioxide diffuses out of the blood and into the alveoli for exhalation. The partial pressures of oxygen and carbon dioxide are important for monitoring lung function, as gas movement occurs down a pressure gradient from areas of high to low concentration.
The document provides information on the structure and function of the human respiratory system. It describes the pathway of air from the nose through the pharynx, larynx, trachea, bronchi and into the lungs. Gas exchange occurs in the alveoli where oxygen diffuses into blood and carbon dioxide diffuses out. The document also discusses lung volumes, the mechanics of breathing, and some common respiratory diseases like asthma, anoxia and tuberculosis.
The document summarizes the key stages and processes of respiration. It discusses:
1) The four main stages of respiration: ventilation, diffusion, transportation of oxygen and carbon dioxide, and gas exchange in tissues and blood.
2) Non-respiratory functions of breathing like moistening air, maintaining pH, and vocalization.
3) How the pleura and pressure gradients enable the lungs to expand and contract during breathing.
4) Major respiratory muscles and how their movement affects rib and sternum movement during inhalation and exhalation.
This PPT covers Anatomy and Physiology of respiratory system. Anatomy of respiratory organs, Mechanism of respiration, Internal Respiration, external respiration, Transport of oxygen in blood, Transport of carbon dioxide in blood, Regulation of respiration, lung volume and lung capacities are explained.
This document discusses physiology of respiration, including lung volumes and capacities, the muscles involved in breathing, pulmonary ventilation, gas exchange, and transport of oxygen and carbon dioxide in the blood. It covers topics like tidal volume, minute ventilation, alveolar ventilation rate, the partial pressures of oxygen and carbon dioxide in inhaled and exhaled air, and how diffusion and Henry's law govern gas exchange between the alveoli and blood in the pulmonary capillaries.
The respiratory system exchanges gases through a series of organs. The document describes the key parts and functions of the respiratory system. It focuses on the nose, which warms, moistens, and filters air before it reaches the lungs. It then describes the pharynx and larynx, which continue guiding air through the upper respiratory tract. The larynx contains cartilages like the thyroid and cricoid that support vocal cord function and air passage.
The respiratory system brings air into the lungs, exchanges oxygen and carbon dioxide between the air sacs and bloodstream, and exhales air. It includes the nasal cavity, pharynx, larynx, trachea, bronchial tubes, and lungs. The nasal cavity cleans and conditions air before it reaches the pharynx and larynx, which direct air to the trachea and lungs for gas exchange to occur in the alveoli.
The respiratory system allows for the exchange of gases in the body. It includes the nose, mouth, throat, trachea, bronchi, lungs, diaphragm and alveoli. The lungs and alveoli work to exchange oxygen and carbon dioxide between the air and blood. Common respiratory disorders include asthma, bronchitis, emphysema and pneumonia which can involve inflammation or infection of the lungs, bronchi or alveoli.
Respiratory system, physiology of respiratory system and neural control sunil JMI
The respiratory system includes the nose, pharynx, larynx, trachea, bronchi, and lungs. Gas exchange occurs in the alveoli of the lungs where oxygen enters the blood and carbon dioxide leaves. Inspiration is an active process involving contraction of the diaphragm and intercostal muscles which increases the thoracic cavity volume. Expiration is usually a passive process involving relaxation of these muscles and elastic recoil of the lungs. The respiratory centers in the medulla control breathing rhythm and depth via nervous and chemical feedback mechanisms.
The respiratory system has three main functions: gas exchange between the atmosphere and blood, filtering and warming of inspired air, and sound production. It has three basic steps: pulmonary ventilation (breathing), external (pulmonary) respiration involving gas exchange in the lungs, and internal (tissue) respiration involving gas exchange in tissues. Inspiration is an active process using inspiratory muscles like the diaphragm and external intercostals to expand the thoracic cavity and lower lung pressure, allowing air to flow in. Expiration is usually a passive process involving elastic recoil of the lungs and chest wall. Other factors like alveolar surface tension, lung compliance, and airway resistance also influence ventilation.
The human respiratory system consists of the upper and lower respiratory tract. The upper tract includes the nose, nasal cavity, sinuses, pharynx and larynx. The lower tract includes the trachea, bronchi, bronchioles and lungs. The nose warms and filters inhaled air. The lungs are the primary organs for gas exchange, extracting oxygen from inhaled air into the bloodstream and releasing carbon dioxide from the bloodstream. Respiration is controlled by respiratory centers in the brainstem which regulate the muscles of breathing.
These slides will help you know about the physiology of the respiratory system. These slides are the simplest version on how to know about the Physiology Of Respiratory System with its applied physiology.
The respiratory system controls breathing by bringing oxygen into the body through the nose and mouth. Air enters the nasal cavity, where it is warmed and filtered before reaching the pharynx and larynx. The larynx contains the vocal cords and epiglottis, which prevent food from entering the trachea. The trachea divides into bronchi that lead into the lungs, where oxygen diffuses into blood vessels in the alveoli and carbon dioxide diffuses out. Breathing is driven by contractions of the diaphragm during inhalation and its relaxation during exhalation.
Anatomy and physiology RESPIRATORY system Ayman Nasr
The document provides an overview of the anatomy and physiology of the respiratory system. It describes the major structures involved, including the nose, pharynx, larynx, trachea, bronchi, lungs and pleurae. It explains the functions of these structures like warming, filtering and humidifying air in the nose, routing air and food in the larynx, and gas exchange in the alveoli. Additionally, it covers topics like breathing mechanics, pulmonary circulation, and assessment of the respiratory system.
The respiratory system consists of an upper respiratory tract and lower respiratory tract. The upper tract includes the nose, pharynx and larynx, and conducts air. The lower tract includes the trachea, bronchi and lungs, and is where gas exchange occurs in the alveoli. Breathing involves inspiration and expiration through cyclic contraction and relaxation of the diaphragm and intercostal muscles. The lungs and pleural membranes allow for efficient gas exchange through a vast surface area in the alveoli.
The respiratory system allows for gas exchange between the lungs and cells of the body. It includes the nose, pharynx, larynx, trachea, bronchi, bronchioles, lungs and alveoli. The nose and pharynx warm and humidify inhaled air before it reaches the lungs. In the lungs, oxygen passes from the alveoli into the bloodstream and carbon dioxide passes out. This allows for cellular respiration to occur.
This document discusses the anatomy and physiology of the respiratory system. It describes the structure and function of the upper airways including the nose, sinuses, and larynx. It then covers the lower airways including the trachea, bronchi, bronchioles, and respiratory units containing the alveoli. It also discusses gas exchange, blood supply, innervation, and control of respiration.
The respiratory system is the network of organs and tissues that help you breathe. It includes your airways, lungs, and blood vessels. The muscles that power your lungs are also part of the respiratory system. These parts work together to move oxygen throughout the body and clean out waste gases like carbon dioxide.
The document describes the structure and function of the respiratory system. It discusses the upper and lower respiratory tract, which are divided into conducting and respiratory portions. The upper tract includes the nose, nasal cavity, sinuses, pharynx and larynx. The lower tract includes the trachea, bronchi and bronchioles which branch into millions of alveoli in the lungs where gas exchange occurs. The document also outlines the processes of breathing, gas exchange, and the roles of various respiratory structures.
In humans, the respiratory tract is the part of the anatomy of the respiratory system involved with the process of respiration. Air is breathed in through the nose or the mouth. In the nasal cavity, a layer of mucous membrane acts as a filter and traps pollutants and other harmful substances found in the air.
Respiration Process which involves taking in oxygen into the cells, using it for releasing energy by burning food and then eliminating the waste products like carbon dioxide and water from the body It is a catabolic process as the food is broken down into simpler form. In short, respiration is a biochemical activity taking place with in the protoplasm of the cell and results in the liberation of energy
2. Breathing and Respiration BREATHING 1. Mechanism by which organisms obtain oxygen from the air and release carbon dioxide 2. It is a physical process 3. It involves lungs of the organism RESPIRATION 1. It includes breathing and oxidation of food in the cells of the organism to release energy 2. It is a biochemical process 3. It involves the mitochondria in the cells where food is oxidized to release energy
The document summarizes the structure and function of the respiratory system. It describes the conducting portion which includes the nasal cavities, pharynx, larynx, trachea, bronchi and bronchioles that warm, humidify and clean the air, but do not involve gas exchange. The respiratory portion includes respiratory bronchioles and alveoli where gas exchange occurs between the blood and air. It then provides detailed descriptions of the trachea, lungs, alveoli, alveolar epithelium consisting of Type-1 and Type-2 pneumocytes, blood-air barrier, interalveolar septum and alveolar phagocytes.
The respiratory system consists of an upper and lower airway. The upper airway includes the nose, which warms, filters, and humidifies air, and the pharynx. The lower airway includes the larynx, trachea, bronchi, and lungs. The lungs contain millions of alveoli where gas exchange occurs between inhaled air and blood via thin epithelial walls. Oxygen diffuses into the blood and carbon dioxide diffuses out of the blood and into the alveoli for exhalation. The partial pressures of oxygen and carbon dioxide are important for monitoring lung function, as gas movement occurs down a pressure gradient from areas of high to low concentration.
The document provides information on the structure and function of the human respiratory system. It describes the pathway of air from the nose through the pharynx, larynx, trachea, bronchi and into the lungs. Gas exchange occurs in the alveoli where oxygen diffuses into blood and carbon dioxide diffuses out. The document also discusses lung volumes, the mechanics of breathing, and some common respiratory diseases like asthma, anoxia and tuberculosis.
The document discusses respiratory physiology, including:
1. Gas exchange occurs between air and capillaries in the lungs and between systemic capillaries and tissues, maintaining oxygen and carbon dioxide levels.
2. The lungs contain over 300 million alveoli that have a large surface area for gas exchange. Each alveolus is lined by a single cell layer for efficient diffusion.
3. Respiration includes ventilation (breathing), gas exchange, and oxygen utilization in cellular respiration. Ventilation is driven by pressure differences induced by changes in lung volume during inspiration and expiration.
The respiratory system obtains oxygen from the air and transports it to cells via respiration. Oxygen diffuses into the lungs and blood, while carbon dioxide diffuses out of the blood and into the air. The blood then transports gases between the lungs and body tissues via internal respiration. Key components include the nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles and alveoli where gas exchange occurs through thin epithelial walls. Hemoglobin transports oxygen in the blood and facilitates diffusion in tissues through factors like pH and temperature changes.
The document summarizes key aspects of the respiratory system, including:
- External respiration involves gas exchange between the lungs and blood, transporting oxygen to tissues and carbon dioxide away. Internal respiration occurs via cellular respiration in mitochondria.
- The respiratory tract involves the nose, pharynx, larynx, trachea, bronchi and bronchioles leading to alveoli where gas exchange occurs by diffusion across pulmonary capillaries.
- Breathing is driven by changes in thoracic pressure and lung volumes via contraction of respiratory muscles and elastic recoil of the lungs and chest wall. Inspiration occurs as lungs fill a expanded chest cavity, expiration when it relaxes.
This document summarizes respiration in animals. It begins with an overview of the topics to be covered, including the anatomy of the respiratory system, external respiration (gas exchange between the lungs and environment), and internal respiration (gas exchange between blood and body tissues). It then defines respiration and describes the modes. The anatomy section details the structures of the airways, lungs, and respiratory muscles. External respiration involves inhaling oxygen and exhaling carbon dioxide between the lungs and air. Internal respiration is gas exchange between blood in the pulmonary capillaries and tissues via diffusion. The cycle of respiration continuously supplies oxygen to tissues and removes carbon dioxide.
Respiratory system pulmonary ventilation.sofian awamleh.pptx مختصرHamzeh AlBattikhi
The document summarizes the structure and function of the respiratory system. It describes the major parts including the nose, pharynx, larynx, trachea, bronchi, lungs and alveoli. It explains how breathing works through the contraction of the diaphragm and movement of the ribs. Gas exchange occurs in the alveoli through diffusion. Various pressures and volumes related to breathing are also defined. Pulmonary ventilation involves the inflow and outflow of air and is regulated by the nervous system and local factors.
The document defines and describes the respiratory system. It outlines the organs involved like the nose, pharynx, larynx, trachea, lungs and their functions. The document also explains the process of respiration from breathing to gas exchange in the lungs and tissues, and defines various lung volumes like tidal volume, inspiratory reserve volume, vital capacity and more.
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The document provides information on the structure and function of the respiratory system. It describes the major components of the respiratory system including the nasal passages, pharynx, larynx, trachea, bronchi, lungs and alveoli. It explains how oxygen and carbon dioxide are exchanged between the alveoli and blood vessels in the lungs through diffusion. The roles of inspiration and expiration in pulmonary ventilation are outlined. Adaptations to exercise such as increased ventilation and oxygen uptake are also summarized.
The document describes the structure and function of the respiratory system. It details the major components including the nasal passages, pharynx, larynx, trachea, bronchi, bronchioles, respiratory bronchioles, alveolar ducts, and alveoli. It explains how air moves through the respiratory tree from the trachea down to the alveoli where gas exchange occurs. It also discusses cellular respiration and the role of oxygen and carbon dioxide exchange between the alveoli and blood in the pulmonary capillaries. Finally, it covers the mechanics of ventilation including atmospheric pressure, intra-alveolar pressure, intra-pleural pressure, and the importance of transmural pressure gradients.
This document provides an overview of respiratory physiology, including:
1. The functions of the respiratory system involve gas exchange through pulmonary ventilation, alveolar ventilation, gas transport in the blood, and exchange in tissues.
2. The anatomical components of the respiratory system include the nose, pharynx, larynx, trachea, bronchi, bronchioles, and alveoli.
3. Pulmonary ventilation is achieved through inspiration and expiration driven by changes in pressure and the contraction of respiratory muscles like the diaphragm and intercostals.
1. Respiratory system physiology (1).pptxMonenusKedir
This document outlines the structures and functions of the respiratory system. It discusses:
1) The conducting zone which includes the nose, trachea, and bronchi that warm and filter air.
2) The respiratory zone including alveoli where gas exchange occurs between the lungs and blood.
3) Pulmonary ventilation which is influenced by tidal volume and respiratory rate.
4) Gas transport, where oxygen binds to hemoglobin and carbon dioxide transports in the bloodstream as bicarbonate, carbaminohemoglobin, and dissolved in plasma.
5) Regulation of respiration by the medullary and pons respiratory centers in the brainstem.
"Discover the latest and most comprehensive PowerPoint presentation on the Respiratory System! Our presentation is perfect for students, educators, and healthcare professionals.
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Detailed diagrams and animations to help you visualize the inner workings of the respiratory system
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Additional materials, such as quizzes and worksheets to supplement your learning
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Breathing and exchange of gases are important for Class 11 students. Breathing or Respiration, is vital for all living organisms as it facilitates the exchange of gases between the body and the environment. In humans, the respiratory system consists of various organs and structures that work together to ensure the intake of oxygen and the removal of carbon dioxide. Understanding the mechanisms of breathing and gas exchange is crucial for comprehending how organisms obtain oxygen for cellular respiration and expel waste carbon dioxide. Let's delve into the intricacies of this fundamental physiological process.
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The document discusses the process of respiration in four parts:
1. Pulmonary ventilation involves breathing air in and out of the lungs through inhalation and exhalation.
2. External respiration is the exchange of oxygen and carbon dioxide between the alveoli in the lungs and blood in the pulmonary capillaries.
3. Internal respiration is the exchange of gases between blood in the systemic capillaries and tissue cells throughout the body.
4. Respiration is regulated through various pulmonary volumes including tidal volume, vital capacity, functional residual capacity, and total lung capacity.
The document discusses the goals and major functional events of respiration, including pulmonary ventilation, diffusion of gases, transport of gases, and regulation of ventilation. It describes the respiratory system and muscles involved in inspiration and expiration. It also covers topics like compliance, surfactant, work of breathing, lung volumes, capacities, factors affecting lung function, and the functions of the respiratory passages.
The document discusses the goals and major functional events of respiration, including pulmonary ventilation, diffusion of gases, transport of gases, and regulation of ventilation. It describes the respiratory system and muscles involved in inspiration and expiration. It also covers topics like compliance, surfactant, work of breathing, lung volumes, capacities, factors affecting lung function, and the functions of the respiratory passages.
The chapter Lifelines of National Economy in Class 10 Geography focuses on the various modes of transportation and communication that play a vital role in the economic development of a country. These lifelines are crucial for the movement of goods, services, and people, thereby connecting different regions and promoting economic activities.
Chapter wise All Notes of First year Basic Civil Engineering.pptxDenish Jangid
Chapter wise All Notes of First year Basic Civil Engineering
Syllabus
Chapter-1
Introduction to objective, scope and outcome the subject
Chapter 2
Introduction: Scope and Specialization of Civil Engineering, Role of civil Engineer in Society, Impact of infrastructural development on economy of country.
Chapter 3
Surveying: Object Principles & Types of Surveying; Site Plans, Plans & Maps; Scales & Unit of different Measurements.
Linear Measurements: Instruments used. Linear Measurement by Tape, Ranging out Survey Lines and overcoming Obstructions; Measurements on sloping ground; Tape corrections, conventional symbols. Angular Measurements: Instruments used; Introduction to Compass Surveying, Bearings and Longitude & Latitude of a Line, Introduction to total station.
Levelling: Instrument used Object of levelling, Methods of levelling in brief, and Contour maps.
Chapter 4
Buildings: Selection of site for Buildings, Layout of Building Plan, Types of buildings, Plinth area, carpet area, floor space index, Introduction to building byelaws, concept of sun light & ventilation. Components of Buildings & their functions, Basic concept of R.C.C., Introduction to types of foundation
Chapter 5
Transportation: Introduction to Transportation Engineering; Traffic and Road Safety: Types and Characteristics of Various Modes of Transportation; Various Road Traffic Signs, Causes of Accidents and Road Safety Measures.
Chapter 6
Environmental Engineering: Environmental Pollution, Environmental Acts and Regulations, Functional Concepts of Ecology, Basics of Species, Biodiversity, Ecosystem, Hydrological Cycle; Chemical Cycles: Carbon, Nitrogen & Phosphorus; Energy Flow in Ecosystems.
Water Pollution: Water Quality standards, Introduction to Treatment & Disposal of Waste Water. Reuse and Saving of Water, Rain Water Harvesting. Solid Waste Management: Classification of Solid Waste, Collection, Transportation and Disposal of Solid. Recycling of Solid Waste: Energy Recovery, Sanitary Landfill, On-Site Sanitation. Air & Noise Pollution: Primary and Secondary air pollutants, Harmful effects of Air Pollution, Control of Air Pollution. . Noise Pollution Harmful Effects of noise pollution, control of noise pollution, Global warming & Climate Change, Ozone depletion, Greenhouse effect
Text Books:
1. Palancharmy, Basic Civil Engineering, McGraw Hill publishers.
2. Satheesh Gopi, Basic Civil Engineering, Pearson Publishers.
3. Ketki Rangwala Dalal, Essentials of Civil Engineering, Charotar Publishing House.
4. BCP, Surveying volume 1
A Visual Guide to 1 Samuel | A Tale of Two HeartsSteve Thomason
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LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UPRAHUL
This Dissertation explores the particular circumstances of Mirzapur, a region located in the
core of India. Mirzapur, with its varied terrains and abundant biodiversity, offers an optimal
environment for investigating the changes in vegetation cover dynamics. Our study utilizes
advanced technologies such as GIS (Geographic Information Systems) and Remote sensing to
analyze the transformations that have taken place over the course of a decade.
The complex relationship between human activities and the environment has been the focus
of extensive research and worry. As the global community grapples with swift urbanization,
population expansion, and economic progress, the effects on natural ecosystems are becoming
more evident. A crucial element of this impact is the alteration of vegetation cover, which plays a
significant role in maintaining the ecological equilibrium of our planet.Land serves as the foundation for all human activities and provides the necessary materials for
these activities. As the most crucial natural resource, its utilization by humans results in different
'Land uses,' which are determined by both human activities and the physical characteristics of the
land.
The utilization of land is impacted by human needs and environmental factors. In countries
like India, rapid population growth and the emphasis on extensive resource exploitation can lead
to significant land degradation, adversely affecting the region's land cover.
Therefore, human intervention has significantly influenced land use patterns over many
centuries, evolving its structure over time and space. In the present era, these changes have
accelerated due to factors such as agriculture and urbanization. Information regarding land use and
cover is essential for various planning and management tasks related to the Earth's surface,
providing crucial environmental data for scientific, resource management, policy purposes, and
diverse human activities.
Accurate understanding of land use and cover is imperative for the development planning
of any area. Consequently, a wide range of professionals, including earth system scientists, land
and water managers, and urban planners, are interested in obtaining data on land use and cover
changes, conversion trends, and other related patterns. The spatial dimensions of land use and
cover support policymakers and scientists in making well-informed decisions, as alterations in
these patterns indicate shifts in economic and social conditions. Monitoring such changes with the
help of Advanced technologies like Remote Sensing and Geographic Information Systems is
crucial for coordinated efforts across different administrative levels. Advanced technologies like
Remote Sensing and Geographic Information Systems
9
Changes in vegetation cover refer to variations in the distribution, composition, and overall
structure of plant communities across different temporal and spatial scales. These changes can
occur natural.
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2. Respiration:
Respiration: It refers to interchange of gases between the
atmosphere and the cells of the body.
– External respiration: Gas exchange (O2 & CO2) between the air
and blood.
– Internal respiration: Gas exchange (O2 & CO2) between the
blood and other tissues and O2 utilization by the tissues of the
body.
Pulmonary Ventilation (breathing): is transport of air to
and from the lungs. Pulmonary ventilation (breathing)
consists of two phases:
– Inspiration (Inhalation) – air in
– Expiration (Exhalation) – air out
3. Functions of the respiratory system:
1. Gas exchange: Uptake of O2 by cells, and the release of CO2 to the
lungs.
2. Acid base balance: CO2 +H2O←→ H2CO3 ←→ H+ + HCO3-
3. Pulmonary defense
4. Respiratory heat loss by evaporation of water: It removes heat and
water from body by warming and saturation the inhalated air with
water vapor.
5. Pulmonary metabolism: The lungs converts substances that pass
through the pulmonary blood vessels, for e.g. Angiotensin I →
angiotensin II.
6. It fascilitates venous return to the heart (Respiratory pump).
7. Production of sound (Vocalization): The larynx contains the paired
vocal folds (vocal cords).
8. Site for olfactory sensation (Smelling)
4. Physiological anatomy of the respiratory system:
The respiratory system is divided into:
1. Upper respiratory system:
- Nose
- Pharynx
2. Lower respiratory system:
- Larynx (Voice box)
- Trachea (Windpipe)
- Bronchi
- Bronchioles
- Alveoli
6. Nose and Pharynx:
• Nose:
– External nose
– Nasal cavity
• Functions:
– Passageway for air
– Filters and cleans the air
– Humidifies, warms air
– Smell
– Along with paranasal
sinuses are resonating
chambers for speech
• Pharynx:
– Common opening for
digestive and respiratory
systems.
– Three regions:
• Nasopharynx
• Oropharynx
• Laryngopharynx
8. Larynx:
• Functions:
– The air passageway between pharynx and trachea.
– The epiglottis prevents food and liquid from entering the larynx
and directed through the pharynx into the esophagus.
– Vocal folds (vocal cords) are primary source of sound production.
10. Trachea:
- It is a flexible tube, extends from the larynx to the
primary bronchi. It transports air to and from the
lungs.
- The wall of the trachea contains 16-20 C-shaped
rings of hyaline cartilage, which keep the trachea
open.
- The mucosa of the trachea is ciliated epithelium
with mucus-producing goblet cells. As in the
larynx the cilia sweep upward toward the
pharynx.
12. Components of the lower respiratory tract:
1. Conducting zone:
- Bronchi
- Bronchioles
- Terminal bronchioles
2. Respiratory zone:
The Site gas exchange (O2 and CO2) between air and blood
which Composed of:
- Respiratory bronchioles
- Alveolar ducts
- Alveolar sacs
15. The lungs:
Physical properties of the lungs:
1. Compliance:
- Distensibility (stretchability)
- The expansibility of the lungs and thoracic wall, necessary
for adequate alveolar ventilation.
- Thoracic compliance may be decreased by factors that
produce resistance to distension for e.g., fractured ribs.
2. Elasticity:
- Tendency of the lungs to return to the initial size after
distension.
- High content of elastin proteins (Recoil ability).
16. Alveoli:
- The functional units of the lungs are the air sacs
called alveoli.
- The alveoli are tiny grape-like sacs which are
branching of the respiratory tree where gas
exchange takes place in the lungs.
- There are about 300 to 400 million alveoli in each
lung with adiameter of about 0.2 milimeter.
- The total surface area is estimated to be about
70m2 in the normal adult human male.
18. There are three major types of the cell in the alveolar wall:
1. Alveolar type I cells: that form most of the alveolar walls
are simple squamous epithelium.
2. Alveolar type II cells: Also called septal cells secrete
pulmonary surfactant, a lipoprotein which mixes with the
tissue fluid within the alveoli and decreases its surface
tension, permitting inflation of the alveoli.
3. Alveolar macrophages: Within the alveoli are
macrophages that phagocytize pathogens or other
foreign material that may not have been swept out by
the ciliated epithelium of the bronchial tree.
20. Surfactant:
- Alveolar fluid contains a substance that reduces surface tension.
This substance is called surfactant.
- Surfactant is greatly reduces the surface tension of water.
- It is secreted by special surfactant-secreting epithelial cells called
alveolar type II cells into alveoli and respiratory passage.
- Surfactant is a complex mixture of several phospholipids for e.g.,
dipalmitoylphosphatidylcholine (DPPC), proteins, and ions.
- It is important at birth. The lungs remain collapsed until birth.
After birth, the infant makes several strong inspiratory
movements and the lungs expand. Surfactant keeps them from
collapsing again.
- Surfactant begins to be produced in late fetal life. For this reason,
premature babies are sometimes born with lungs that lack
sufficient surfactant and their alveoli are collapsed as a result.
This condition is called respiratory distress syndrome (RDS).
22. The Pleurae:
A double-layered sac surrounding each lung:
- Parietal pleura( outer layer)
- Visceral pleura (directly on lung)
Pleural cavity: The space between the visceral and parietal pleurae filled with pleural
fluid which is lubricate movement of lung within the cavity.
24. Mechanics of respiration:
At rest:
• Inspiration:
- Diaphragm conrtraction→chest volume↑ (lungs expansion)
→intrapleural pressure ↓→alveolar pressure<atmospheric
pressure→air is sucked into the lungs.
(At the end of an inspiration, alveolar pressure=atmospheric
pressure and airflow stops )
• Expiration:
- Diaphragm relaxation→chest volume↓ (lungs conrtraction)
→intrapleural pressure ↑→alveolar pressure>atmospheric
pressure→ air is pushed out of the lungs. Therefore,
expiration is a passive process. (At the end of an exspiration,
also alveolar pressure=atmospheric pressure and airflow
stops )
27. Stronger ventilation:
- Muscles of the chest wall help produce changes in
chest volume beyond that produced by the
contraction and relaxation of the diaphragm.
- Contraction of the external intercostal muscles
helps increase the volume of the chest for
stronger inspiration. while contraction of the
internal intercostal muscles helps to decrease
chest volume for stronger expiration.
28. Lung Pressures:
- Atmospheric pressure: It is the pressure excreted by
the weight of air in atmosphere. It is about 760 mmHg.
- Intrapulmonary pressure (alveolar pressure): It is the
pressure of the air inside the alveoli.
- Intrapleural pressure: It is the pressure of the fluid in
the thin space between the lung pleura (visceral
pleura) and the chest wall pleura (parietal pleura). It is
always less than Intrapulmonary pressure.
- Transpulmonary pressure: It is the difference beween
the alveolar pressure and intrapleural pressure.
30. Lung Volumes:
- Tidal volume (TV): The volume of air inspired or expired
during a normal inspiration or expiration; its amount is
about 500 mL in the adult male.
- Inspiratory reserve volume (IRV): The amount of air
inspired forcefully after inspiration of normal tidal
volume (3000 mL).
- Expiratory reserve volume (ERV): The amount of air
forcefully expired after expiration of normal tidal
volume(1100 mL)
- Residual volume (RV): The volume of air remaining in
respiratory passages and lungs after the most forceful
expiration (1200 mL).
32. Lung Capacities:
- Inspiratory capacity (IC): The maximal amount of air which can be
inspired after a normal expiration.
IC = Tidal volume (TV) + Inspiratory reserve volume (IRV)
- Vital Capacity (VC): The maximum amount of air which can be
expired after a maximal inspiration.
VC= Inspiratory reserve volume (IRV) + Tidal volume + Expiratory
reserve volume (ERV)
- Total lung capacity (TLC): The amount of air contained in the lungs at
the end of maximal inspiration.
TLC = Vital capacity + Residual volume (RV)
- Functional residual capacity (FRC): The amount of air that remains in
the lungs at the end of normal expiration.
FRC = Expiratory reserve volume (ERV)+ Residual volume (RV)
34. Pulmonary Ventilation:
- Respiratory rate or frequency: The number of breaths taken per
minute (12 breaths/min).
- Pulmonary ventilation: The amount of air inspired per minute.
Pulmonary ventilation = Respiratory rate X Tidal volume
= 12 breaths/min X 500 ml = 6 L/min.
- Alveolar ventilation: The total volume of fresh air entering the alveoli
per minute.
= respiratory rate X (Tidal volume – Dead space volume)
= 12 X (500 – 150)= 4.2 L/min
Minute ventilation: Total amount of air moved into and out to of
Respiratory system per min.
35. - Anatomical dead space: The volume of conducting air
ways at which there is no gaseous exchange (about
150ml) increase with age.
- Alveolar dead space: Volume of inspired air that is not
used for gas exchange .
- Physiological dead space: The sum of Anatomic and
Alveolar dead space.
36. Gas exchange in the lungs:
Air-Blood barrier (Pulmonary membrane, respiratory
membrane, Alveolar-Capillary barrier):
• The membrane which gas exchange occurs which is about 0.2 µm.
• The alveolar-capillary barrier is composed of:
- A thin alveolar epithelium
- An epithelial basement membrane
- A thin interstitial space between the alveolar basement membrane
and capillary basement membrane.
- A capillary basement membrane that in many places fuses with the
alveolar epithelial basement membrane
- The capillary endothelial membrane
• The total surface area of the respiratory membrane is about 70m2 in
the normal adult human male.
38. Partial Pressures:
• Dalton’s Law
– Law of Partial Pressures
• “each gas in a mixture of gases will exert a pressure independent
of other gases present”
Or
• The total pressure of a mixture of gases is equal to the sum of the
individual gas pressures.
– Atmospheric components
• Nitrogen = 78% of our atmosphere
• Oxygen = 21% of our atmosphere
• Carbon Dioxide = 0.033% of our atmosphere
• Water vapor, krypton, argon, …. Make up the rest
PATM = PN2 + P02 + PC02 + PH20= 760 mm Hg.
38
39. Changes in Partial Pressure:
• In inspired air:
– PO2=160 mmHg
– PCO2=0.3 mmHg
– PH2O=5.7 mmHg
– PN2=596 mmHg
• In alveolar air (mixing with dead space air):
– PO2=104 mmHg
– PCO2=40 mmHg
• In venous blood entering the lungs:
– PO2=40 mmHg
– PCO245 mmHg
• O2 diffuses across the respiratory surfaces into blood, CO2
flows from blood to alveolar air.
• Expired air is saturated with water vapor.
40. • In expired air:
– PO2=120 mmHg
– PCO2=27 mmHg
– PH2O=47 mmHg
– PN2=565 mmHg
• Arterial blood leaving the lungs:
– PO2=95 mmHg
– PCO2=40 mmHg
• In the tissues, concentrations of gases and pressures
exerted by them vary depending on the amount of
metabolic activity going on in the tissue at any one time.
– PO2=20 mmHg
– PCO2=46 mmHg
• O2 flows from blood to tissues, and CO2 from tissues to
blood.
41. Change in partial pressure in pulmonary capillary and tissue capillary
42. Transport of gases in the blood:
I. Oxygen Transport:
• O2 is carried in two ways by the blood:
1. Dissolved in plasma: (1.5 %)
The amount of O2 in the plasma is proportional to
the partial pressure. At a pressure of 100 mmHg,
0.3 ml O2 is dissolved in every 100ml blood.
2. Combined with hemoglobin: (98.5 %)
Most of the O2 is carried in combination with
hemoglobin. Each hemoglobin molecule having the
capacity to combine with four molecules of O2.
45. Factors affecting Hb-O2 dissociation curve:
The ability of Hb to hold O2 is decreased by:
1. A decrease in pH,
2. An increase in carbon dioxide, or
3. An increase in temperature,
4. The presence of 2.3-diphosphoglycerate (2,3-DPG) in
red blood cells stimulate the release of O2 from HbO2.
47. Transport of Carbon Dioxide:
Carbon dioxide is transported by:
1. Dissolved in plasma (10%):
- The solubility of CO2 in blood is about 20 times that of O2, so that there
is more CO2 than O2 in simple solution.
2. Carbaminohemoglobin (CO2+Hb) (20%):
- The CO2 can combine with amine (-NH2) groups in proteins to form
carbonic compounds. Because more amine groups are available in
hemoglobin than in plasma proteins, more CO2 combines with
hemoglobin than with plasma proteins to form carbamino
compounds.
3. Bicarbonate ions HC03
- (70%):
- Red blood cells contain the enzyme carbonic anhydrase, which
catalyzes the combination of H2O with CO2.
CO2 + H2O carbonic anhydrase H2CO3 H + + HCO3
-
51. Regulation of Respiration:
The respiratory center is located in the pons and medulla
oblongata of the brain stem:
1. Pons: It consist of two respiratory control center:
a). Apneustic center: It promotes the inspiration.
b). Pneumotaxic center: It mainly controls rate and depth of breathing
(Respiratory rhythm). It inhibits the inspiration.
2. Medullary oblongata: It consist of the following groups of the
neurons:
a). Dorsal respiratory group (DRG): Mainly cause inspiration (Normal
quiet breathing)
b). Ventral respiratory group (VRG): cause expiration and inspiration
(Labored respiration)
53. Dorsal respiratory group (DRG):
- It is located in the dorsal portion of medulla.
- The signal transmitted from this group through the motoneuron
phrenic nerve mainly to diaphragm and cause normal quiet
breathing.
- The signal are rhythmic and ramp in nature. When signal stop
suddenly will allow the elastic recoil of lung and chest wall to cause
expiration.
Ventral respiratory group (VRG):
- It is located in the ventral aspect of medulla.
- They send signals to inspiratory and expiratory muscle during active
or labored respiration.
Pneumotaxic center:
- It is located dorsally in the superior portion of the pons, which mainly
controls the rate and depth of breathing.
- The normal function of the pneumotaxic center is unknown, but it
may play a role in switching off between inspiration and expiration.
55. Chemical control of respiration:
1. Central chemoreceptors (Chemosensitive area):
- It is located in the ventral surface of medulla and sensitive to change
of PCO2 and H+ concentration.
- The chemoreceptors monitor the H + concentration of CSF, including
the brain interstitial fluid. CO2 readily penetrates membranes,
including the blood-brain barrier, whereas H + and HCO3-
penetrate slowly.
- The CO2 that enters the brain and CSF is promptly hydrated. The
H2CO3 dissociates, so that the local H+ concentration rises. Any
increase in spinal fluid H+ concentration stimulates respiration.
The magnitude of the stimulation is proportionate to the rise in H+
concentration.
- Thus, the effects of CO2 on respiration are mainly due to its
movement into the CSF and brain interstitial fluid, where it
increases the H+ concentration and stimulates receptors sensitive
to H +.
57. 2. Peripheral chemoreceptors:
They are located outside the brain in the:
- Carotid bodies in the bifurcation of the common carotid
arteries.
- Aortic bodies along the arch of the aorta.
- They are especially important for detecting changes in O2
in the blood, although they also respond to a lesser
extent to changes in CO2 and H+ ion concentrations.
- They are stimulated by decreasing of PO2 in blood, and
also by increasing of PCO2 and H+ ions in blood.
60. Common Terms:
- Eupnea: Normal, comfortable breathing at rest.
- Apnea: Cessation of breathing.
- Dyspnea: Unpleasant, subjective feeling of difficult or
labored breathing.
- Polypnea: Increased depth or rate of breathing or both.
- Polypnea: Rapid, shallow breathing.
61. Pulmonary Disorders:
- Acute respiratory disease syndrome (ARDS): It is a severe
inflammatory disease of the lung. The inflammation leads to
impaired gas exchange.
- Infant respiratory distress syndrome (IRDS): It is a syndrome
caused by lack of surfactant in the lungs of premature infants.
- Pneumothorax: The presence of gas in the intrapleural space (the
space between the visceral and parietal pleurae) causing the
lungs to collapse.
- Pulmonary fibrosis: The normal structure of lungs disrupted by
accumulation of fibrous connective tissue proteins.
62. - Emphysema: The loss of elasticity in the lungs leads to
prolonged times for exhalation. This leads to a smaller
volume of gas exchanged per breath.
- Chronic bronchitis: It occurs when an abundance of
mucus is produced by the lungs and the air passages
become clogged with mucus.
- Lung cancer: It is a common form of cancer causing the
uncontrolled growth of cells in the lung tissue.
- Pneumonia: It is an infection of the lung parenchyma,
which can be caused by both viruses and bacteria.
Cytokines and fluids are released into the alveolar cavity
in response to infection, causing the effective surface
area of gas exchange in the lungs to be reduced.
63. Atelectasis: It mean collapse of alveoli due to obstruction of
air way or lack of surfactant.
Asphyxia: In asphyxia produced by occlusion of the airway,
acute hypercapnia and hypoxia develop together.
Drowning: Drowning is asphyxia caused by immersion,
usually in water.
Asthma: It is characterized by airway obstruction, airway
inflammation, and airway hyper-responsiveness to a
variety of stimuli. Proteins released from eosinophils in
the inflammatory reaction may damage the airway
epithelium causing the amount of air flow into the lungs
to be greatly reduced. The usual cause of asthma is
contractile hypersensitivity of the bronchioles in response
to foreign substances in the air such as plant pollen and
irritants in smog.
64.
65. Hypoxia:
Hypoxia: It is O2 deficiency at the tissue level.
Traditionally, hypoxia has been divided into four types:
1. Hypoxic hypoxia (anoxic anoxia): in which the PO2 of the
arterial blood is reduced.
2. Anemic hypoxia: in which the arterial PO2 is normal but
the amount of hemoglobin available to carry O2 is
reduced.
3. Stagnant Hypoxia:
Hypoxia due to slow circulation is a problem in organs
such as the kidneys and heart during shock.
4. Histotoxic Hypoxia:
Hypoxia due to inhibition of tissue oxidative processes is
most commonly the result of cyanide poisoning. Cyanide
inhibits cytochrome oxidase and possibly other enzymes.65
66. Cyanosis:
- The term cyanosis means blueness of the skin, and its
cause is excessive amounts of deoxygenated hemoglobin
in the skin blood vessels, especially in the capillaries.
- It is most easily seen in the nail beds and mucous
membranes and in the earlobes, and lips, where the skin
is thin.
Carbon monoxide (CO) poisoning:
- The CO poisoning is toxic because it reacts with
hemoglobin to form carboxyhemoglobin (COHb)
- The COHb cannot take up O2.
68. Structure of Avian respiratory system
• The mouth or the nostrils (nares).
• The pharynx
• The trachea (Windpipe).
• Primary bronchi
• Air sacs
• Lungs
69. - The trachea branches into two primary bronchi at the
syrinx. The syrinx is situated at bifurcation of the
trachea, and it function as sonic membrane (voicebox).
- The primary bronchi enter the lungs and branch off into
dorsobronchi which lead into smaller parabronchi.
- Parabronchi can be several millimeters long and 0.5-2.0
mm in diameter (depending on the size of the bird) and
their walls contain hundreds of tiny, branching 'air
capillaries' surrounded by a profuse network of blood
capillaries. It is within these 'air capillaries' that the
exchange of gases (oxygen and carbon dioxide) between
the lungs and the blood occurs.
- After passing through the parabronchi, air moves into the
ventrobronchi.
72. Avian air sacs:
• The air sacs is thin walled, about 10 times the
volume of the lungs. It situated between the internal
organs in the thoracic and abdomen.
• The air sac extend into the proximal bones of the
extrimities, and the skull. Replacing bone marrow
with air makes the bird lighter.
• Gas exchange does not occur across the wall of the
air sacs.
• The air sacs function as bellows, to ventilate the
lungs with fresh air with higher O2 content during
both inspiration and expiration. The pulmonary air
flow is continuous and unidirectional through
respiratory cycle.
73. Most species of the birds have nine air sacs:
• One interclavicular sac
• Two cervical sacs
• Two anterior thoracic sacs
• Two posterior thoracic sacs
• Two abdominal sacs
Posterior sacs
Anterior sacs
74. Figure: The air sacs of birds extend into the humerus (the bone
between the shoulder and elbow), the femur (the thigh bone),
the vertebrae and even the skull.
75. Figure: Comparison of avian and mammals respiratory system:
a). The avian 'unidirectional' respiratory system where gases are exchanged
between the lungs and the blood in the parabronchi.
b). The mammals 'bidirectional ' respiratory system where gas exchange
occurs in small dead-end sacs called alveoli.
76. Figure: Avian respiration occurs in two cycle:
First inspiration: The air flows through the trachea and bronchi into the
posterior air sacs.
First expiration: The air flows from the posterior air sacs to the lungs.
Second inspiration: air flows from the lungs to the anterior air sacs.
Second expiration: The air flows from the anterior sacs back through
the trachea and out of the body.
77. Figure: The cross-current gas-exchange mechanism
operating in the avian lung (between the blood
capillaries and air capillaries).