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: -By adulthood, we each have 60, 000 miles of blood vessels inside our bodies – that’s more than twice the distance around the world. Those vessels keep blood flowing, supplying your tissues with oxygen and nutrients, and keeping your organs, including the heart, healthy.

Detailed explanation-3: -Types of blood cells. There are 3 types of blood cells – red blood cells, white blood cells and platelets. Red blood cells (erythrocytes) carry oxygen to all cells in the body.