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Remember: For gas exchange a partial pressure difference must exist between 1) alveoli and blood and 2) blood and body cell Physiology of Internal and External Respiration based on Partial Pressure of Oxygen and Carbon dioxide P Atima COUT Nveokus POz= 40mmity pOz? loomm Hy pcOzí 40 mm Hg IN omm PO2= 40 mm Hg PCO2: 46 mm Hg 40 mmillg catilay pog= 40 mm Hg CO- 40manty Body cell Looking at the picture above let us try to understand some concepts. Answer the following questions: The PO2 in the atmosphere The PCO2 in the atmosphere = Once taken in, the PO2 is 100 mmHg and PCO2 is 40 mm Hg. How is this possible? (Hint: Mixing with residual volume)!! Now look at the blue vessel (LEFT SIDE): The PO2 = The PCO2 = %3D

Remember: For gas exchange a partial pressure difference must exist between 1) alveoli and blood and 2) blood and body cell Physiology of Internal and External Respiration based on Partial Pressure of Oxygen and Carbon dioxide P Atima COUT Nveokus POz= 40mmity pOz? loomm Hy pcOzí 40 mm Hg IN omm PO2= 40 mm Hg PCO2: 46 mm Hg 40 mmillg catilay pog= 40 mm Hg CO- 40manty Body cell Looking at the picture above let us try to understand some concepts. Answer the following questions: The PO2 in the atmosphere The PCO2 in the atmosphere = Once taken in, the PO2 is 100 mmHg and PCO2 is 40 mm Hg. How is this possible? (Hint: Mixing with residual volume)!! Now look at the blue vessel (LEFT SIDE): The PO2 = The PCO2 = %3D

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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**Educational Content: Physiology of Internal and External Respiration** **Understanding Gas Exchange:** Gas exchange in the human body relies on a crucial principle: a partial pressure difference must exist between: 1. The alveoli and blood. 2. The blood and body cells. **Diagram Explanation:** The diagram illustrates the partial pressures of oxygen (PO₂) and carbon dioxide (PCO₂) at various stages of respiration. 1. **Atmospheric Air:** - PO₂ = 160 mmHg - PCO₂ = 0.25 mmHg 2. **Alveoli:** - PO₂ = 100 mmHg - PCO₂ = 40 mmHg - Notes the direction of flow: Air moves IN and OUT of the alveoli. 3. **Capillary Blood (Entering Lungs):** - PO₂ = 40 mmHg - PCO₂ = 46 mmHg 4. **Capillary Blood (Leaving Lungs):** - PO₂ = 100 mmHg - PCO₂ = 40 mmHg 5. **Body Cells:** - PO₂ = 40 mmHg - PCO₂ = 46 mmHg **Concept Questions:** - **Partial Pressures in the Atmosphere:** - PO₂ = ? - PCO₂ = ? - **Respiratory Exchange:** - Once inhaled, why does the PO₂ decrease to 100 mmHg, and PCO₂ increase to 40 mmHg? Consider the mixing of fresh air with residual volume in the lungs! - **Capillary Exchange (LEFT SIDE):** - PO₂ = ? - PCO₂ = ? Understanding these differences in partial pressures is essential for comprehending how oxygen enters the blood and carbon dioxide is expelled, facilitating efficient respiration and cellular function.
Transcribed Image Text:**Educational Content: Physiology of Internal and External Respiration** **Understanding Gas Exchange:** Gas exchange in the human body relies on a crucial principle: a partial pressure difference must exist between: 1. The alveoli and blood. 2. The blood and body cells. **Diagram Explanation:** The diagram illustrates the partial pressures of oxygen (PO₂) and carbon dioxide (PCO₂) at various stages of respiration. 1. **Atmospheric Air:** - PO₂ = 160 mmHg - PCO₂ = 0.25 mmHg 2. **Alveoli:** - PO₂ = 100 mmHg - PCO₂ = 40 mmHg - Notes the direction of flow: Air moves IN and OUT of the alveoli. 3. **Capillary Blood (Entering Lungs):** - PO₂ = 40 mmHg - PCO₂ = 46 mmHg 4. **Capillary Blood (Leaving Lungs):** - PO₂ = 100 mmHg - PCO₂ = 40 mmHg 5. **Body Cells:** - PO₂ = 40 mmHg - PCO₂ = 46 mmHg **Concept Questions:** - **Partial Pressures in the Atmosphere:** - PO₂ = ? - PCO₂ = ? - **Respiratory Exchange:** - Once inhaled, why does the PO₂ decrease to 100 mmHg, and PCO₂ increase to 40 mmHg? Consider the mixing of fresh air with residual volume in the lungs! - **Capillary Exchange (LEFT SIDE):** - PO₂ = ? - PCO₂ = ? Understanding these differences in partial pressures is essential for comprehending how oxygen enters the blood and carbon dioxide is expelled, facilitating efficient respiration and cellular function.
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