Which heart sound marks the start of systole?

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Multiple Choice

Which heart sound marks the start of systole?

Explanation:
Opening of systole is signaled by the closure of the atrioventricular valves—the mitral and tricuspid valves—as the ventricles begin to contract. That abrupt valve closure creates the first heart sound, the familiar “lub.” It marks the start of ventricular systole. The second heart sound comes later, when the semilunar valves close at the end of systole (“dub”), while S3 and S4 are associated with filling phases in diastole—S3 with rapid filling early in diastole and S4 with atrial contraction late in diastole. Therefore, the first heart sound is the one that marks the start of systole.

Opening of systole is signaled by the closure of the atrioventricular valves—the mitral and tricuspid valves—as the ventricles begin to contract. That abrupt valve closure creates the first heart sound, the familiar “lub.” It marks the start of ventricular systole. The second heart sound comes later, when the semilunar valves close at the end of systole (“dub”), while S3 and S4 are associated with filling phases in diastole—S3 with rapid filling early in diastole and S4 with atrial contraction late in diastole. Therefore, the first heart sound is the one that marks the start of systole.

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