What Produces The Lub Dub Heart Sounds -

Second Heart Sound (S2) Physiological Phase: Ventricular Diastole (Relaxation) Primary Cause: Closure of the Semilunar Valves

Notice the rhythm: Lub...Dub...pause...Lub...Dub...pause. what produces the lub dub heart sounds

The first sound, (clinically known as S1), marks the beginning of systole —the phase where the heart squeezes blood out . (clinically known as S1)