How does the lung respond to regional lung hypoxia?
a. Bronchial artery vasoconstriction
b. Bronchial artery vasodilation
c. Pulmonary artery vasoconstriction
d. Pulmonary artery vasodilation
ANS: C
Areas of regional lung hypoxia, as the result of reduced ventilation, congestion, and/or airway obstruction, can result in local pulmonary arterial vasoconstriction and cause blood flow to be shifted from these areas toward areas of higher O2 content and pulmonary vasodilation.
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