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Question

 When are the sound "LUB" and "DUB" produced respectively during heart beat?
 


Solution

The first sound LUB is produced when the atrioventricular valves i.e. tricuspid and bicuspid valves close at the start of ventricular systole. The second sound DUP is produced at the beginning of ventricular diastole when the pulmonary and aortic semilunar valves close.

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