The first heart sound (lub) is associated with the
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a
opening of atrioventricular valves
b
opening of semilunar valves
c
closure of atrioventricular valves
d
closure of semilunar valves
answer is C.
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Detailed Solution
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.