With each beat, the heart pumps around 130 ml of blood. Pulse - places around the body where heartbeat can be felt. Arteries - blood vessels that carry blood AWAY from the heart. Arteries have thick, muscular walls which can expand and contract.
Capillaries also help control the amount of heat lost through the skin.
Veins - blood vessels that carry blood back to the heart. Average person has 5-6 liters of blood. Platelets - aid in blood clotting 3. Blood is a transport system. O 2 from the lungs to body cells b. food substances from the digestive tract to body cells.