Lub-dub Sounds Link

Spoiler alert: It’s not the heart muscle contracting, and it’s not the blood whooshing around.

The powerful lower chambers of your heart (the ventricles) begin to contract. This sudden spike in pressure slams shut the two top valves: the Mitral and Tricuspid valves. These valves separate the upper chambers (atria) from the lower chambers. When they close, they vibrate, creating that thudding "lub" sound. lub-dub sounds

A sharper, higher-pitched, shorter "dub." Spoiler alert: It’s not the heart muscle contracting,

Thump-thump. Thump-thump.

It’s the most famous two-syllable sound on Earth. From the first time a doctor presses a stethoscope to a newborn’s chest, we are taught to listen for the “lub-dub.” But have you ever stopped to wonder what actually creates that iconic sound? Is it the heart beating? The blood moving? Or something else entirely? These valves separate the upper chambers (atria) from

"The squeeze is starting. No blood is allowed back into the top rooms." Breaking Down the "Dub" (S2) The second sound, "Dub" (clinically known as S2 ), marks the end of systole and the beginning of rest (diastole).

"The squeeze is over. We are locking the exit doors to keep blood moving forward." The Silence in Between Have you noticed the pause between the "lub" and the "dub"? That silence is the systolic pause (the squeeze). The longer pause after the "dub" is the diastolic pause (the rest/fill).