The heart is a hollow muscle that pumps blood around the body
Arteries, 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.