Question
The second heart sound (dup) is the sound of thea. pacemaker initiating its contraction.b. blood entering the aorta.c. closing of the semilunar valves.d. closing of the atrioventricular (AV) valves.
Step 1
Step 1: The second heart sound, also known as "dup", is associated with a specific event in the cardiac cycle. Show more…
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