The “lub dub” sound of your heartbeat is CLOSING of the valves, not opening! 🫀✨ 🔊 S1 = “Lub” Happens when the atrioventricular (AV) valves close — that’s the tricuspid and mitral valves shutting after blood flows from the atria to the ventricles. 🔊 S2 = “Dub” Occurs when the semilunar valves (aortic and pulmonic) close — right after the ventricles have pumped blood out to the body and lungs. 💡Lub = start of systole 💡Dub = start of diastole #cardiaccycle #heartsounds #stethoscope #S1 #lubdub
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