Which Vessel Has Only the Tunica Intima Layer

Question

Which vessel has only the tunica intima layer?
A) artery
B) vein
C) arteriole
D) venule
E) capillary

Accepted Answer

Capillaries have only one layer of endothelial cells called the tunica intima. This allows for the exchange of nutrients, gases, and waste products between the blood and tissues. Arteries, veins, arterioles, and venules all have additional layers of smooth muscle and connective tissue.