What Causes The Lub Dub Sound Of Your Heartbeat Jun 2026

A healthy heart creates a steady rhythm of lub-dub... pause... lub-dub . But what happens during that pause?

The (the S2 sound ) marks the end of systole and the beginning of diastole —the resting/filling phase. what causes the lub dub sound of your heartbeat

The "lub-dub" sound of a heartbeat is caused by the . Each "lub" and "dub" corresponds to a specific pair of valves snapping shut to prevent blood from flowing backward, ensuring it moves in one direction through the circulatory system. 1. The "Lub" Sound (S1) The first heart sound, known medically as S1 , is the "lub". A healthy heart creates a steady rhythm of lub-dub

The lub-dub of the heartbeat is the soundtrack of human life. It is not the sound of the heart working, but rather the sound of the heart protecting itself—ensuring that blood flows in only one direction. But what happens during that pause

These valves sit between the upper chambers (atria) and the ventricles. Closing them prevents blood from being pushed back into the atria when the ventricles squeeze. 2. The "Dub" Sound (S2) The second heart sound, known as S2 , is the "dub".

Here’s a secret your ears don’t usually catch. The two parts of the "dub" are not perfectly synchronized. The aortic valve (left side) closes a fraction of a second the pulmonary valve (right side). This is because the left side of the heart operates at much higher pressure.