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Your cardiovascular system consists of your heart, blood vessels, and blood. This system works constantly-every second of your life-delivering oxygen and nutrients to your cells, and carrying away carbon dioxide and other unnecessary material.

Your heart drives this process. It is a muscle that contracts and relaxes over and over again, moving the blood along the necessary path. Your heart beats about 100,000 times each day, pumping the equivalent of 2,000 gallons of blood throughout your body.

The two sides, or chambers, of the heart receive blood and pump it back into the body. The right ventricle of the heart pumps blood into the lungs to exchange carbon dioxide from the cells for oxygen. The heart relaxes to allow this blood back into its left chamber. It then pumps the oxygen-rich blood to tissues and organs. Blood passing through the kidneys allows the body to get rid of waste products. Electrical signals keep the heart pumping continuously and at the appropriate rate to propel this routine.


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