Скачать или смотреть Heart Sounds Explained 🫀

The “lub dub” sound of your heartbeat is the CLOSING of the valves, not the 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

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