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The heart is a beating muscle that pumps blood throughout the body. Inside the heart, four valves open and shut in a precise sequence that keeps the blood moving in the appropriate direction. A malformed or damaged valve may not close properly, allowing blood to leak backwards. This condition is called valvular regurgitation, or valvular insufficiency.
In a healthy heart, two valves control the flow of blood from the upper chambers, or atria, to the lower ... more
