Capillaries
A) have a lot of smooth muscle in their walls.
B) are a location of gas and nutrient exchange.
C) are more numerous in such tissues as bone and dense connective tissue.
D) experience very high internal pressures.
E) have all of these properties.

Question

Quizplus · Accepted Answer

Capillaries are the site of gas and nutrient exchange between the blood and tissues. They have very thin walls made up of a single layer of endothelial cells, which allows for efficient diffusion of molecules. They do not have a lot of smooth muscle in their walls and are not more numerous in dense connective tissue or bone. They also do not experience very high internal pressures.