Which of the following statements regarding the cardiac cycle is TRUE?
A. The AV valves are open during mid-to-late diastole.
B. The aortic valve is open during isovolumetric ventricular contraction.
C. The first heart sound is caused by the closing of the semilunar valves.
D. The dicrotic notch is a result of closure of the AV valves.
E. Closure of the AV valves occurs when the ventricles reach end-systolic volume.
A
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Indicate whether the statement is true or false
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