A) The thinness of the capillary wall
B) Minimal branching in the capillary bed
C) Increased blood velocity through the capillaries
D) The high pressure in the interstitial spaces
E) The stratification of the capillary wall

A) endothelium
B) adventitia
C) pericapillary layer
D) thoroughfare layer
E) tunica adventitia

A) serve as valves in veins.
B) are found in the tunica media.
C) carry blood under high pressure.
D) control the blood flow into capillary beds.
E) are voluntary structures.