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Lub-dub Sounds __exclusive__ ❲DIRECT ✪❳

A sharper, higher-pitched, shorter "dub."

A slightly lower-pitched, longer "lub."

"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). lub-dub sounds

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? A sharper, higher-pitched, shorter "dub