A patient has a chronic respiratory disorder and vasoconstriction of her pulmonary vascular system. What is the chief control over this vasoconstriction?
a. Low PAO2
b. Low PaO2
c. High PaCO2
d. High pH
A
A low PAO2 (pressure of alveolar oxygen) is primarily responsible for pulmonary vasoconstriction. Arterial oxygen and carbon dioxide values and pH are not causes.
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