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Which of the following best describes th...

Which of the following best describes the processof gas exchange in the lungs?

A

Air moves in and out of the alveoli during breathing.

B

Carbon dioxide diffuses from deoxygenated blood in capillaries into the alveolar air.

C

Oxygen and carbon dioxide diffuse down their concentration gradients between blood and alveolar air.

D

Oxygen diffuses from alveolar air into deoxygenated blood.

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