Which statement correctly pairs a heart sound with its timing?

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Multiple Choice

Which statement correctly pairs a heart sound with its timing?

Explanation:
Heart sounds come from valve closures and reflect phases of the cardiac cycle. S1 occurs when the atrioventricular valves (mitral and tricuspid) close at the onset of ventricular systole, as the ventricles begin to contract to push blood into the aorta and pulmonary artery. S2 happens when the semilunar valves (aortic and pulmonary) close at the end of systole, marking the start of diastole. So S1 marks the beginning of systole, making this statement correct. The other timing claims conflict with the actual valve events: S2 does not mark the beginning of systole, and S1 does not mark the end of diastole.

Heart sounds come from valve closures and reflect phases of the cardiac cycle. S1 occurs when the atrioventricular valves (mitral and tricuspid) close at the onset of ventricular systole, as the ventricles begin to contract to push blood into the aorta and pulmonary artery. S2 happens when the semilunar valves (aortic and pulmonary) close at the end of systole, marking the start of diastole. So S1 marks the beginning of systole, making this statement correct. The other timing claims conflict with the actual valve events: S2 does not mark the beginning of systole, and S1 does not mark the end of diastole.

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