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Question

Differentiate between lub and dub sound.


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Solution

Lub sound refers to the first sound of heart tone produced by the closure of the atrioventricular valve.

Dub sound refers to the second sound of heart tone produced by the closure of semilunar valves.

Lub soundDub sound
The first sound of a heartbeat.The second sound of a heartbeat.
The lub sound corresponds with ventricular systole.The dub sound corresponds with atrial systole,
Closure of the atrioventricular valve produces a loud lub sound.Closure of aortic and pulmonary valve produces soft dub sound.

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