Human Physiology Chapter 8: Respiratory System II
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Questions and Answers

What is the PO2 of oxygen-poor blood entering the pulmonary capillaries at rest?

  • 95 mm Hg
  • 104 mm Hg
  • 40 mm Hg (correct)
  • 75 mm Hg

    • In which direction does oxygen diffuse along its partial pressure gradient in the alveolus?

  • Along the surface of the alveolus
  • From the blood into the alveolus
  • Out of the pulmonary capillaries
  • From the alveolus into the blood (correct)

    • What is the PCO2 of the alveolar air?

  • 75 mm Hg
  • 40 mm Hg (correct)
  • 95 mm Hg
  • 45 mm Hg

    • What happens to the PCO2 of the blood as it flows past the alveolus?

    <p>It decreases</p> Signup and view all the answers

    What is the purpose of ventilation-perfusion coupling?

    <p>To maintain alveolar airflow proportional to pulmonary capillary blood flow</p> Signup and view all the answers

    What process occurs simultaneously with the loading of oxygen into the blood?

    <p>Unloading of carbon dioxide from the blood</p> Signup and view all the answers

    What is the result of the partial pressure gradient of oxygen in the alveolus?

    <p>Oxygen diffuses into the blood</p> Signup and view all the answers

    What is the primary function of the alveolus?

    <p>To facilitate the exchange of gases between the lungs and the environment</p> Signup and view all the answers

    What is the difference between the PCO2 of the alveolar air and the PCO2 of the blood entering the pulmonary capillaries?

    <p>The PCO2 of the blood is higher</p> Signup and view all the answers

    What is the result of the partial pressure gradient of carbon dioxide in the alveolus?

    <p>Carbon dioxide diffuses out of the blood</p> Signup and view all the answers

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