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What causes the famous “Lub-Dub” sound of the heart? ❤️🫀
The heartbeat sound is produced by the closing of the heart valves, not by the heart muscle itself. The first sound, “Lub” (S1), occurs when the mitral and tricuspid valves close as the ventricles begin to contract. The second sound, “Dub” (S2), occurs when the aortic and pulmonary valves close as the ventricles relax. These sounds help ...
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