Veins are able to constrict and increase venous return because of their:
A)smooth muscle receiving parasympathetic impulses
B)valves receiving parasympathetic impulses
C)smooth muscle receiving sympathetic impulses
D)valves receiving sympathetic impulses

Question

Quizplus · Accepted Answer

Smooth muscle in veins receives sympathetic impulses, which causes it to constrict and increase venous return. Valves in veins prevent backflow of blood but do not have the ability to receive impulses. Parasympathetic impulses generally do not affect the smooth muscle in veins.

Veins Are Able to Constrict and Increase Venous Return Because