Which of the following is not a mechanism that facilitates return of venous blood to the heart?
A) Gravity,for veins that are above the heart
B) Contraction of skeletal muscles
C) Breathing
D) Contraction of smooth muscle in most veins of the body
E) Valves in veins

Question

Quizplus · Accepted Answer

Contraction of smooth muscle in most veins of the body is not a mechanism for facilitating return of venous blood to the heart. Instead, the contraction of skeletal muscles, breathing, valves in veins, and even gravity (for veins that are above the heart) all help push blood back towards the heart.

Which of the Following Is Not a Mechanism That Facilitates