Something that carries blood away from the heart

largest arteries near the heart

smallest veins

The innermost tunic of a vessel wall

carry oxygen poor blood

These venules function very much like capillaries

The three tunics that surround the central blood-filled space

what is the smallest artery

prevent the backflow of blood away from the heart

The larger arteries and veins have tiny arteries, capillaries, and veins in their tunica externa.

most common type of capillary, occurring in most organs of the body such as skin, skeletal muscles, and the nervous system

aids venous return

The outer most layer of the vessel wall

pores in the endothelial cells allow passage of many small molecules

Where vessels unite and interconnect