Blood flow through capillaries is controlled by

Question

Quizplus · Accepted Answer

Blood flow through capillaries is controlled by both the contraction and relaxation of smooth muscle in the walls of arterioles and the action of precapillary sphincters. Arterioles can regulate blood flow to capillaries by changing their diameter and thus altering resistance to blood flow. The precapillary sphincters can also control which capillaries are perfused with blood by opening and closing in response to metabolic demands. Therefore, option B is the best choice as it includes both precapillary sphincters and smooth muscle in arterioles.

Blood Flow Through Capillaries Is Controlled by