Which of the following statements about alveolar gas exchange is correct?

Practice question

Question

Which of the following statements about alveolar gas exchange is correct?

Options

Choose one · Correct answer highlighted

Gas exchange occurs through active transport. Oxygen diffuses from the blood into the alveoli. The diffusion of gases occurs due to partial pressure gradients. Correct Carbon dioxide moves into the blood from the alveoli.

Explanation

Gas exchange occurs passively through diffusion, driven by partial pressure gradients of oxygen and carbon dioxide.

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