What Makes The Lub Sound In The Heart -

It’s the valves hitting each other like cymbals. Instead:

The is caused by the turbulent closing of the atrioventricular (AV) valves —specifically the tricuspid valve (on the right side of the heart) and the mitral valve (on the left side of the heart)—at the beginning of ventricular contraction (systole). what makes the lub sound in the heart

When the heart's lower chambers (ventricles) contract, the pressure inside them rises sharply. This pressure forces the two AV valves—the tricuspid valve and the mitral (bicuspid) valve —to snap shut simultaneously. It’s the valves hitting each other like cymbals

The "lub" sound occurs at the start of , the phase when the heart’s lower chambers (ventricles) begin to contract to pump blood throughout the body. How the Heart Works - How the Heart Beats | NHLBI, NIH This pressure forces the two AV valves—the tricuspid

Shortly after the "lub," you hear a shorter, higher-pitched "dub." This sound is caused by the semilunar valves (the aortic and pulmonary valves) snapping shut.