In fact, your heart is mostly silent during the actual pump.
The "Dub" is the sound of the escape hatches closing after the blood has left. Part 4: The Bizarre Physics of the Silent Gap Notice the rhythm: Lub...Dub...pause...Lub...Dub...pause. what produces the lub dub heart sounds
As the ventricles finish squeezing, the pressure inside them drops rapidly. The blood that was just blasted into the arteries (the lungs and body) suddenly wants to rush backward into the heart. It’s like a wave hitting a seawall. In fact, your heart is mostly silent during the actual pump
And as long as you hear Lub...Dub...pause , you know the show is still going. As the ventricles finish squeezing, the pressure inside
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.
To stop this backflow, the (pulmonary and aortic) snap shut. Unlike the fleshy AV valves, these look like three tiny crescent moons (hence "semilunar") shaped like a Mercedes-Benz logo.