When a valve fails to close properly, blood leaks backward—creating a whoosh or hiss on top of the normal lub-dub. That’s a . Conversely, if a valve fails to open properly (becoming stiff or calcified), the heart has to push harder, and you might hear a clicking or a harsh, ejection-like sound.
The (the S2 sound ) marks the end of systole and the beginning of diastole —the resting/filling phase. what causes the lub dub sound of your heartbeat
Contrary to popular belief, the sound of your heartbeat is the muscle contracting, nor is it blood simply “whooshing” through chambers. The truth is more mechanical, more dramatic, and involves the violent snapping shut of tiny, parachute-like valves. When a valve fails to close properly, blood
There are two main types of valves involved in the "lub-dub": The (the S2 sound ) marks the end
It is caused by the simultaneous closure of the mitral and tricuspid valves (the atrioventricular valves).
In a perfectly healthy, quiet room, you might actually hear a third sound, known as . This sound occurs right after the "dub." It sounds like a low-frequency thud (often described as lub-dub-ta ). In young athletes or pregnant women, this can be normal, caused by the sound of blood rushing quickly into a filling ventricle. However, in older adults, an S3 sound can indicate heart failure.