The first heart sound represents which portion of the cardiac cycle? a. atrial systole b. ventricular systole c. closing of the atrioventricular valves d. closing of the semilunar valves
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This occurs during ventricular systole, when the Show more…
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The "lub," or first heart sound, is produced by closing of the a. aortic semilunar valve. c. tricuspid valve. b. pulmonary semilunar d. bicuspid valve. valve. e. both AV valves.
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