One of the most important mechanisms for maintaining venous return to the right atrium is:
A) cardiac output.
B) capillary hydrostatic pressure.
C) skeletal muscle contraction.
D) respiratory cycling.

Question

Quizplus · Accepted Answer

Skeletal muscle contraction helps pump blood through the veins back to the heart, especially in the lower limbs where blood has to flow uphill against gravity. This mechanism is known as the skeletal muscle pump and is crucial for maintaining venous return to the right atrium. Cardiac output, capillary hydrostatic pressure, and respiratory cycling also play important roles in cardiovascular function, but they are not the most important for maintaining venous return.

One of the Most Important Mechanisms for Maintaining Venous Return