Read the following statements (a-d) with respect to heart sounds during cardiac cycle
(a) Two prominent sounds are produced which can be easily heard through a stethoscope
(b) The first heart sound (lub) is associated with the closure of the AV valves
(c) The second heart sound (dub) is associated with the opening of the semilunar valves
(d) These sounds do not have any clinical diagnostic significance
In the above, the correct statements are

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a and c

b and c

a and b

c and d

answer is C.

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Detailed Solution

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

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