How does lung perfusion work in ventilation-perfusion coupling?
A. Alveolar capillaries constrict where the partial pressure of oxygen is low, so blood is diverted to where the partial pressure of oxygen is high.
B. If partial pressure of carbon dioxide increases, the bronchioles dilate.
C. Air flow is directed to lobules where partial pressure of carbon dioxide is high.
D. If partial pressure of carbon dioxide decreases, the bronchioles constrict.
Answer: A
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