"Lubb" sound produced during heart beat is caused by :

Ventricular diastole

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Ventricular systole

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Artial diastole

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Artial systole

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Solution

The correct option is C Ventricular systole
There are four heart sounds, each corresponding to a particular event in the cardiac cycle. The first two are most easily distinguished, and sound through the stethoscope like 'lubb dup'. The first sound, 'lubb', is fairly loud and is due to the closure of the atrioventricular valves. This closure corresponds with the start of the Ventricular systole.
So, the answer is B.

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