A common point of confusion in reviews is ignoring the pause.
The familiar "lub-dub" sound isn't the heart muscle contracting, nor is it blood simply sloshing around. It is the sound of . why does the heart make a lub dub sound
A healthy heart has a crisp, clear "lub-dub... lub-dub." Doctors listen for: A common point of confusion in reviews is ignoring the pause
The "lub" is the first heart sound (S1) and signals the beginning of , the phase when the heart's lower chambers (ventricles) contract to pump blood out. A healthy heart has a crisp, clear "lub-dub
After the ventricles finish squeezing, they relax. The blood that was just pushed into the pulmonary artery and the aorta tries to rush back down into the heart due to gravity and back-pressure. The valves at the exit of the heart snap shut to stop this backward flow.
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)
The heart's rhythmic beat is generated by the coordinated contraction and relaxation of the heart's chambers. The sound is produced by the closure of the heart's valves, specifically the atrioventricular (AV) valves (mitral and tricuspid valves) and the semilunar valves (aortic and pulmonary valves). When the heart contracts, the AV valves close, producing the "lub" sound, while the semilunar valves close, creating the "dub" sound.