Heartbeat Sound Lub Dub 〈Popular × 2024〉

A lower-pitched, longer sound marking the start of systole. It occurs when the atrioventricular (AV) valves (mitral and tricuspid) snap shut as the ventricles contract.

The "lub-dub" sound is the sound of the heartbeat, which is produced by the closing of the heart valves. The sound is created by two distinct sounds: heartbeat sound lub dub

A low, slightly prolonged sound. Think Luuub . What is happening: The atrioventricular (AV) valves are closing. A lower-pitched, longer sound marking the start of systole

Longer, lower, louder, at the start of systole (contraction). at the start of systole (contraction).