During the cardiac cycle, the movement of the valves causes sounds that can be heard using a stethoscope.
What causes the first sound after atrial systole in the cardiac cycle?
1 closing of the atrioventricular valves
2 opening of the semilunar valves
3 closing of the semilunar valves
1 )
1 and 2
2 )
1 and 3
1 only
4 )
3 only
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