What Produces The Lub Dub Heart Sounds [2021] Guide

The chaos is the Lub-Dub. The first sound, "Lub" (clinically known as S1), marks the beginning of systole —the phase where the heart squeezes blood out .

But sound needs vibration, and muscle contraction is a relatively smooth, slow process. It generates almost no audible noise. If you could stand inside a healthy heart during a beat, you wouldn’t hear a "crunch" or a "squeeze." You’d hear... silence, followed by chaos. what produces the lub dub heart sounds

Place your hand on the left side of your chest. Feel that? Thump-thump... thump-thump. The chaos is the Lub-Dub

Then comes (S2), marking the end of systole and the beginning of diastole (relaxation). It generates almost no audible noise

For most of us, it’s the most reliable metronome we’ll ever own. We call it a heartbeat, but in medical terms, it’s known as the . It’s so familiar that we rarely question it. We assume the sound is simply the heart contracting like a fist squeezing blood.