In order for efficient pulmonary gas exchange to occur: Select one: A. the pulmonary capillaries must be completely constricted and the alveoli must be collapsed. B. there must be low quantities of pulmonary surfactant to allow for full alveolar expansion. C. the percentage of inhaled carbon dioxide must exceed the percentage of inhaled oxygen. D. oxygen and carbon dioxide must be able to freely diffuse across the alveolar–capillary membrane.

In order for efficient pulmonary gas exchange to occur:
Select one:
A. the pulmonary capillaries must be completely constricted and the alveoli must be collapsed.
B. there must be low quantities of pulmonary surfactant to allow for full alveolar expansion.
C. the percentage of inhaled carbon dioxide must exceed the percentage of inhaled oxygen.
D. oxygen and carbon dioxide must be able to freely diffuse across the alveolar–capillary membrane.

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