Answer:
(b)During each cardiac
cycle two prominent sounds are produced which can be easily heard through a
stethoscope.
Semi lunar value- The
second sound of the heart is high pitched ?DUB? It is caused by vibrations
associated with closure of aortic and pulmonary valves. It lasts for an about
0.12 seconds with the frequency of 50 Hz, while tricuspid value, bicuspid value
and both the value together are associates with first heart (i.e., lubb).
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