How lub dubs in a minute in the heart
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The "lub" is the first heart sound, commonly termed S1, and is caused by turbulence caused by the closure of mitral and tricuspid valves at the start of systole. The second heart sound, "dub" or S2, is caused by the closure of the aortic and pulmonic valves, marking the end of systole.
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The lub dub sound that is one heartbeat 72 times in a minute. The sound lub is produced due to the closing of bicuspids and tricuspid valves during ventricular systole and the dub sound is heard due to the closing of semilunar valves during ventricular diastole.
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