Summary Of The First Two Sounds Lub-Dub

Decent Essays
The first two sounds “lub-dub” are associated with the closing of the heart valves. The first sound “lub” occurs at the beginning of systole as the atrioventricular (AV) valves close and the semilunar (SL) valves open. The second sound “dub” occurs when the SL valves close and AV valves open which marks the end of systole.

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