Lub-dub Sound -

The "Lub-Dub" sound is the acoustic signature of a functioning heart. Contrary to popular belief, these sounds are caused by blood hitting the heart walls. Instead, they are caused by the sudden closure of the heart valves, which creates vibrations that travel through the chest wall.

The ventricles finish pumping blood out to the lungs and body and begin to relax. lub-dub sound

| Sound | Medical Term | What causes it? | Timing | |-------|--------------|----------------|--------| | (S1) | First heart sound | Mitral & Tricuspid valves closing | Start of systole (ventricles contract to pump blood out) | | Dub (S2) | Second heart sound | Aortic & Pulmonic valves closing | End of systole / start of diastole (ventricles relax to fill) | The "Lub-Dub" sound is the acoustic signature of

The “lub-dub” sound is so recognizable that engineers use it to test medical simulators, and musicians have sampled it for ambient and electronic music (e.g., Dark Side of the Moon by Pink Floyd uses a synthesized heartbeat as a motif). The ventricles finish pumping blood out to the

Say the following sequence crisply:

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