A) lubb due to closure of AV valves
B) lubb due to closure of spiral valves
C) dupp due to closure of AV valves
D) dupp due to closure of spiral valves
Correct Answer: A
Solution :
The first heart sound is lubb due to closure of AV valves (atrioventicular or tricuspid and bicuspid valves) at the beginning of ventricular systole.
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