The 'lubb' and 'dubb'' heart sounds are due to:

Opening of heart valves

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Action of papillary muscles

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Closing of heart valves

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Activity of pacemaker

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Solution

The correct option is C Closing of heart valves
During each cardiac cycle, two prominent sounds are produced, which can be easily heard through a stethoscope. The first heart sound (lubb) is associated with the closure of the tricuspid and bicuspid valves, whereas the second heart sound (dubb) is associated with the closure of the semilunar valves. These sounds are of clinical diagnostic significance.

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