External Respiration Quiz
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Questions and Answers

What primarily drives the movement of oxygen and carbon dioxide during external respiration?

  • Concentration gradients of the gases (correct)
  • Differences in blood flow
  • Cellular activity levels
  • Temperature fluctuations

    • How does a decrease in partial pressure of oxygen at high altitudes affect gas exchange?

  • It enhances oxygen diffusion into the bloodstream.
  • It has no effect on gas exchange.
  • It reduces the overall oxygen diffusion rate. (correct)
  • It increases the solubility of oxygen in blood.

    • What would likely occur if there is reduced alveolar ventilation?

  • Increased carbon dioxide levels in alveoli (correct)
  • Improved gas exchange efficiency
  • Increased pulmonary blood flow
  • Decreased bronchiole diameter

    • Which factor has the least impact on the diffusion of gases during external respiration?

    <p>Temperature of the surrounding environment</p> Signup and view all the answers

    What is the relationship between pulmonary blood flow and bronchiole diameter during changes in ventilation?

    <p>Decreased blood flow causes bronchioles to constrict.</p> Signup and view all the answers

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