The heart
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THE SYSTEMIC CIRCUIT
- How it works: The oxygen and nutrient rich blood in the left atrium flows into the left ventricle. From there it is pumped into the aorta. The aorta is an artery that divides into arterioles and capillaries that eventually reach all the organs of the body except the lungs
As it passes through the body's tissues and organs, the blood releases nutrients and oxygen and picks up waste substances and carbon dioxide. Then it flows back into the right atrium of the heart through the venae cavae and the pulmonary circuit begins again
In the pulmonary circuit, the blood releases carbon dioxide into the alveoli and picks up oxygen. In the systemic circuit, the blood delivers oxygen and nutrients to the all the cells so that they can carry out the vital functions, and picks up carbon dioxide and waste produced by cellular metabolism