Skip To Main Content

What Is Lub Dub Sound (Top × BREAKDOWN)

A murmur is a valve closing. It is the sound of turbulent blood flow .

The order is based on the in the heart cycle. Systole (contraction) always comes before diastole (relaxation). The AV valves (lub) must close at the start of contraction. The semilunar valves (dub) close at the end of contraction. what is lub dub sound

If you’ve ever listened to a healthy heart through a stethoscope, the sound you hear is a familiar, two-beat rhythm: lub-dub, lub-dub, lub-dub . This is not just a random noise; it is the acoustic signature of your heart valves snapping shut. It is the sound of life itself. A murmur is a valve closing

But what exactly causes these two distinct sounds? Why doesn't the heart make just one sound? And what happens when "lub-dub" turns into something else, like a "whoosh" or a "click"? If you’ve ever listened to a healthy heart

During diastole, the ventricles are relaxing and filling with blood from the atria. No major valves are snapping shut, so there is no loud sound. This silence is just as important as the beats, because it is the time when the heart refills for the next pump.

Team
Best Choice to Learn, Work & Lead

A murmur is a valve closing. It is the sound of turbulent blood flow .

The order is based on the in the heart cycle. Systole (contraction) always comes before diastole (relaxation). The AV valves (lub) must close at the start of contraction. The semilunar valves (dub) close at the end of contraction.

If you’ve ever listened to a healthy heart through a stethoscope, the sound you hear is a familiar, two-beat rhythm: lub-dub, lub-dub, lub-dub . This is not just a random noise; it is the acoustic signature of your heart valves snapping shut. It is the sound of life itself.

But what exactly causes these two distinct sounds? Why doesn't the heart make just one sound? And what happens when "lub-dub" turns into something else, like a "whoosh" or a "click"?

During diastole, the ventricles are relaxing and filling with blood from the atria. No major valves are snapping shut, so there is no loud sound. This silence is just as important as the beats, because it is the time when the heart refills for the next pump.