First slide

Circulatory Pathways

Question

The first heart sound (lub) is associated with the

Easy

A

opening of atrioventricular valves
B

opening of semilunar valves
C

closure of atrioventricular valves
D

closure of semilunar valves

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.

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