19. The Blood Vessels

Which of the following correctly describes the flow of blood through a mesenteric capillary bed when the precapillary sphincters are constricted?

Blood flow in the capillaries is steady despite the rhythmic pumping of the heart because of the:

a. Elasticity of the large arteries

b. Small diameter of capillaries

c. Thin walls of the veins

d. Venous valves

Capillaries consist of:

a. Three thin tunics

b. Only a thin tunica intima with a well-developed internal elastic lamina

c. A thin sheet of endothelium with a basal lamina

d. Stratified epithelium