Blood flow through capillaries is regulated by
A) one-way valves in the veins.
B) precapillary sphincters.
C) skeletal muscle contraction.
D) elastic valves.
E) the tunica intima.

Question

Quizplus · Accepted Answer

The precapillary sphincters are small rings of smooth muscle that regulate blood flow into capillary beds. They can constrict to divert blood flow away from a capillary bed or dilate to increase blood flow to a capillary bed.

Blood Flow Through Capillaries Is Regulated by