Your 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

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Quizplus · Accepted Answer

Low PAO2 is the chief control over vasoconstriction of the pulmonary vascular system. This is because low PAO2 causes hypoxia, which leads to the release of vasoconstrictors such as endothelin-1 and thromboxane A2. These vasoconstrictors cause the pulmonary arteries to constrict, which increases pulmonary vascular resistance and decreases blood flow to the lungs.

Your Patient Has a Chronic Respiratory Disorder and Vasoconstriction of Her