When ventilation is compromised but perfusion continues:
A. air movement into and out of the lungs is adequate, but diffusion is impaired.
B. the alveoli are filled with fresh oxygen, but it cannot diffuse into the blood.
C. more CO2 diffuses across the pulmonary-capillary membrane and is eliminated.
D. blood passes over some alveolar membranes without gas exchange taking place.
Answer: D. blood passes over some alveolar membranes without gas exchange taking place.
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