The three principal mechanisms for increasing venous return during dynamic exercise are __________.

Question

Quizplus · Accepted Answer

Venoconstriction, the pumping action of muscle, and the pumping action of the respiratory system all contribute to increasing venous return during dynamic exercise. Option A is incorrect because a decrease in stroke volume (SV) and heart rate (HR) would actually decrease venous return. Additionally, compliance of the vascular system would increase, making it easier for blood to flow through the veins. Option C is incorrect because an increase in vascular resistance would impede blood flow, making it more difficult for blood to return to the heart. Increase in HR and decrease in blood pressure do not necessarily lead to an increase in venous return, and may actually decrease it in certain circumstances.

The Three Principal Mechanisms for Increasing Venous Return During Dynamic