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A healthy heart, which beats about 100,000 times a day, supplies the body with oxygen-rich blood. The heart is a muscular organ that has four chambers. Blood is pumped through the four chambers with the help of four heart valves - the aortic valve, the pulmonic valve, the mitral valve, and the tricuspid valve. During an average lifetime, these valves will open and close over two billion times. Heart valves open when the heart pumps to allow blood to flow. They close quickly between heartbeats to make sure the blood does not flow backward. Any trouble with this normal flow will make it hard for the heart to pump the blood where it needs to go. The aortic valve controls the flow of blood as it exits the heart and is pumped to the rest of the body.

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