What Is The Lub Dub Sound In Your Heart [work] Jun 2026

The "lub-dub" sound of a heartbeat is the sound of your heart valves closing as they direct blood flow through the heart's chambers. These sounds, known medically as S1 and S2, mark the two main phases of the cardiac cycle: systole and diastole. Licensed by Google The "Lub" (S1)

The "lub-dub" sound is not the sound of the heart muscle squeezing, nor is it the sound of blood rushing through the chambers. Instead, it is the sound of what is the lub dub sound in your heart

Doctors use a stethoscope to listen to these sounds (a process called cardiac auscultation ) because they provide a window into your cardiovascular health. nhlbi, nih (.gov)https://www.nhlbi.nih.gov How the Heart Works - How the Heart Beats | NHLBI, NIH The "lub-dub" sound of a heartbeat is the