Lub Dub Sound Of Your Heartbeat — What Causes The

Here is a deep dive into the mechanics behind the "lub-dub" and what that rhythm tells us about the health of the body’s most vital organ.

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. what causes the lub dub sound of your heartbeat

In short:

It is caused by the closure of the aortic and pulmonary valves (the semilunar valves). Here is a deep dive into the mechanics