The first heart sound "lubb" (or S1) corresponds to AV valves closing. The second heart sound "dubb" (or S2) corresponds to the closing of semilunar valves closing.
The closing of these valves are so forceful that you can hear these when you are listening to heart beats of a person/patient and this is what we refer to when we are listening to someones heart beat!
Answer 1:
Answer 2:
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