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In the lub-dub version of heart sound, dub is caused by the back rush of blood against a closed aortic or pulmonary valve.

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What is the LUBDUB sound we hear when listening to the heart?

The "LUB" sound is created by the closing of the mitral and tricuspid valves during systole as blood is pumped out of the ventricles. The "DUB" sound is caused by the closing of the aortic and pulmonary valves during diastole as the ventricles relax and fill with blood. Together, these sounds represent the normal functioning of the heart's valves during the cardiac cycle.


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