NO GUESSING PLEASE Perfusion/ventilation balancing in the lungs is accomplished

Question

NO GUESSING PLEASE

Perfusion/ventilation balancing in the lungs is accomplished by two reflexive mechanisms:

bronchoconstriction in response to low alveolar Pco2, and

A. bronchodilation in response to high alveolar Po2 levels.

B. vasoconstriction of pulmonary arterioles in response to low alveolar Po2.

C. vasoconstriction of pulmonary arterioles in response to high alveolar Po2.

D. vasoconstriction of pulmonary arterioles in response to low alveolar Pco2.

E. vasodilation of pulmonary arterioles in response to high alveolar Pco2.

Explanation / Answer

C. vasoconstriction of pulmonary arterioles in response to high alveolar Po2.

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