The heart is a hollow muscle that pumps blood around the bodyArteries, carry oxygenated blood around the body. Veins, carry deoxygenated blood back to the heart and lungs. The large artery is the aorta, the large vein is the vena cava.
The movement of the blood through the heart and around the body is called circulation and the heart takes less than 60 seconds to pump blood to every cell in your body. Blood delivers oxygen to all the body’s cells and without oxygen these cells would die. The heart is sort of a double pump, which circulates blood around the body to provide the oxygen and nutrients the body needs, while carrying away the waste. The left side of the heart receives oxygen ‐ rich blood from the lungs and pumps it out to every part of the body.
Oxygen from blood reacts with sugar in the cells to make energy and the waste product of this process, carbon dioxide, is carried away from the cells in your blood. Blood needing more oxygen is sent back to the heart to begin the cycle again. The right side of the heart receives oxygen ‐ poor blood from the body and pumps it to the lungs where it unloads carbon dioxide and picks up oxygen.
The right ventricle pumps the blood to the lungs, where carbon dioxide is removed from the blood and sent out of the body when we exhale. A fresh breath of oxygen through inhale enter the blood in the lungs to start the process again. The heart transports all the blood around your body about 1000 times in a day.