When blood arrives at an alveolus,
A) the concentration of oxygen is lower in the alveolus than in the blood.
B) the concentration of carbon dioxide is higher in the alveolus than in the blood.
C) the concentration of carbon dioxide is higher in the blood than in the alveolus.
D) the concentration of carbon dioxide in the blood is equal to the concentration of oxygen in the alveolus.
Correct Answer:
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