AP BIOLOGY

Detailed explanation-1: -There are three types of blood vessels: Arteries carry blood away from your heart. Veins carry blood back toward your heart. Capillaries, the smallest blood vessels, connect arteries and veins.

Detailed explanation-2: -This vast system of blood vessels-arteries, veins, and capillaries-is over 60, 000 miles long. That’s long enough to go around the world more than twice! Blood flows continuously through your body’s blood vessels.

Detailed explanation-3: -Venules are the smallest veins and receive blood from capillaries. They also play a role in the exchange of oxygen and nutrients for water products. There are post-capillary sphincters located between the capillaries and venules. The venule is very thin-walled and easily prone to rupture with excessive volume.

Detailed explanation-4: -Therefore, five types of blood vessels are arteries, veins, capillaries, arterioles, and venules.