Which of the Following is Not True of Capillaries

Question

Which of the following is not true of capillaries?
A) They are made up only of endothelium.
B) The endothelium has one-way valves.
C) They receive blood from arterioles.
D) They are where material is exchanged with the cells.

Accepted Answer

Capillaries do not have one-way valves in their endothelium. Arterioles deliver blood to capillaries, which are made up solely of a single layer of endothelial cells. Capillaries are the site of material exchange between the bloodstream and the body's cells.