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.
In short: (AV valves close). Dub (Semilunar valves close). Pause (Heart refills). Repeat 60–100 times per minute. That is the rhythm of life. what is lub dub sound
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
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"? In short: (AV valves close)
LUB (ventricles squeeze, AV valves close) → DUB (ventricles relax, semilunar valves close) → pause (heart fills with blood) → LUB ... Part 4: Lub-Dub vs. Dub-Lub (A Common Confusion) People often ask: Why is it "lub-dub" and not "dub-lub"?