The exchange of oxygen and carbon dioxide occurs by a process of diffusion, in which:
A. gases in the cells remain in equal concentration until arterial oxygen levels fall.
B. carbon dioxide is not allowed to move across the pulmonary capillary membrane.
C. gas moves from an area of lower concentration to an area of higher concentration.
D. gas moves from an area of higher concentration to an area of lower concentration.
Ans: D. gas moves from an area of higher concentration to an area of lower concentration.
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