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EasyZoologyHeart sounds
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Which of the following is responsible for the lub sound of the heart?
A
Closure of the semilunar valves at the beginning of ventricular diastole.
B
Closure of the tricuspid and bicuspid valves at the end of ventricular systole.
C
Closure of the tricuspid and bicuspid valves at the beginning of ventricular systole.
D
Blood hitting the wall of the ventricles during rapid filling.
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