The exchange of oxygen and carbon dioxide between alveolar air and blood occurs mainly by
Options
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A.
Active transport
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B.
Diffusion
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C.
Osmosis
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D.
Filtration
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E.
Endocytosis
Correct Answer (Detailed Explanation is Below)
B.
Diffusion
Detailed Explanation
Oxygen and carbon dioxide cross the respiratory membrane primarily by diffusion down their respective partial-pressure gradients.