19. The Blood Vessels

Which type of capillary is characterized by a discontinuous basement membrane, allowing for the easy passage of larger molecules and cells?

Which of the following areas of the body has the highest concentration of capillary beds?

Which of the following best describes the microcirculatory flow of blood (microcirculation)?

Which scenario results in constriction of arterioles & precapillary sphincters in mesenteric capillary beds?

Large molecules such as peptides and proteins move into and out of the bloodstream by way of:

(a) Continuous capillaries

(b) Fenestrated capillaries

(c) Thoroughfare channels

(d) Venules

The local control of blood flow due to the action of precapillary sphincters is:

(a) Vasomotion

(b) Autoregulation

(c) Selective resistance

(d) Turbulence

How is the anatomy of capillaries and capillary beds well suited to their function?

Why do capillaries permit the diffusion of materials, whereas arteries and veins do not?