Oxygen diffusion from the alveolus to the pulmonary capillary occurs because
A. alveolar PCO2 is greater than capillary PCO2.
B. alveolar PO2 is less than capillary PCO2.
C. carbon dioxide diffuses faster than oxygen.
D. oxygen diffuses faster than carbon dioxide.
E. alveolar PO2 is greater than capillary PO2.
Answer: E
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