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?

Which structure regulates blood flow distribution in mesenteric capillary beds & diverts blood from one area to another based on local metabolic needs?

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?

List three ways in which substances can cross the capillary wall.

Which of the following structures is the 'leakiest'?

a. Continuous capillary

b. Sinusoidal capillary

c. Precapillary sphincter

d. Fenestrated capillary