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Lub sound produced by heart is caused by...

Lub sound produced by heart is caused by

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Dub sound of heart is caused by

The "lubb" sound (first heart sound) is caused by

The "lubb" sound (first heart sound) is caused by

The "lubb" sound (first heart sound) is caused by

The "lubb" sound (first heart sound) is caused by 1. filling of the ventricles 2. ventricular contraction 3. closing of the AV valves 4. closing of semilunar valves

When are the 'lubb' and dubb' sounds produced by heart?

The cause of hearing of sound, produced in one room, in a nearby room is

"Lub' sound of heart beat is louder than 'Dubb'heart sound. Why?