at which stage of cardiac cycle is second heart sounds heard
1- initial stage of ventricular systole
2-atrial systole
3- initial stage of joint diastole
4-Halt stage of ventricular diastole

Dear student,The second heart sound, S2, is the sound of the closing of the semilunar valves during ventricular diastole and is described as a “dub”. So, the answer is option (4)

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