Which statement accurately describes alveolar exchange of oxygen?
A. Oxygen diffuses from the alveolus to the blood because the alveolus has a higher partial pressure of oxygen.
B. Oxygen diffuses from the alveolus to the blood because the alveolus has a lower partial pressure of oxygen.
C. Oxygen diffuses from the blood to the alveolus because the alveolus has a higher partial pressure of oxygen.
D. Oxygen diffuses from the blood to the alveolus because the alveolus has a lower partial pressure of oxygen.
A
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