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  4. The first heart sound 'lubb? (1) marks the beginning of ventricular systole (2) marks the end of ventricular systole (3) is due to closure of atrioventricular valves (4) is produced by the closure of semilunar valves

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Q. The first heart sound 'lubb?
(1) marks the beginning of ventricular systole
(2) marks the end of ventricular systole
(3) is due to closure of atrioventricular valves
(4) is produced by the closure of semilunar valves

BHUBHU 2009

Solution:

Each heart beat is accompanied by two heart sounds. The first heart sound of 'lubb' marks the beginning of ventricular systole and is due to closure of atrioventricular valves. The second heart sound of 'dupp' marks the end of ventricular systole and beginning of its diastole. It is produced by the closure of semilunar valves.