Here is the breakdown of each syllable.
The short pause between the "lub" and the "dub" is (ventricles squeezing). The longer pause after the "dub" before the next "lub" is diastole (ventricles relaxing and filling). That rhythm is what you feel as your pulse. why does the heart make a lub dub sound
The "lub-dub" sound of a heartbeat is not produced by the heart muscle contracting, but rather by the as they direct blood flow . These sounds, known medically as S1 and S2, mark specific phases of the cardiac cycle and ensure that blood moves in a single direction. The First Sound: "Lub" (S1) Here is the breakdown of each syllable