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  4. Lub sound produced during heart beat is caused by

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Q. Lub sound produced during heart beat is caused by

AMUAMU 2012Body Fluids and Circulation

Solution:

Lubb ($S_{1}$, first sound, systolic sound) is the first heart sound which is louder or low pitched, of long duration ($0.16-0.19$ seconds) and is produced due to closure of atrioventricular valves (tricuspid and bicuspid) during ventricular systole.