Vein, takes blood through body. Compared to arteries, veins are thin-walled vessels with large and irregular lumens.

Artery, pumps blood out of heart. The elastic arteries are the largest Arteries,they have the largest lumens. Muscular arteries, have thicker tunica media is thicker than other layers. arterioles are the smallest arteries.

Capillaries, exchange between the blood and the cells of the body takes place. Only one cell thick supply's organs with blood.

Blood vessels