Which of the following situations would be expected to decrease pulmonary vascular resistance?

Question

Quizplus · Accepted Answer

Moderate exercise is associated with increased pulmonary blood flow and recruitment of previously closed capillaries in the lungs, which results in a decrease in pulmonary vascular resistance. Ascent to high altitude (A) causes hypoxic pulmonary vasoconstriction, which increases pulmonary vascular resistance to match the decreased oxygen availability at high altitude. Stimulation of the sympathetic nervous system (B) can cause vasoconstriction in the pulmonary circulation and increase pulmonary vascular resistance. Expiration to the residual volume (C) may increase airway resistance, but it has no direct effect on pulmonary vascular resistance.

Which of the Following Situations Would Be Expected to Decrease