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The first heart sound, S, (lub), is caused largely by the contraction of the ventricles and the subsequent: closing of the
During atrial systole: the pulmonary and aortic semilunar valves are open the tricuspid and bicuspid valves are closed the tr
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Answer #1

1. Option A is correct as the S1 (lub) the first heart sound is caused by the contaction of ventricles and subsequent closing of tricuspid and bicuspid valve (mitral valve)

2. Option C is correct during atrial systole tricuspid and bicuspid valves are open causing the pumping of the blood in the ventricles

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