Heartbeat Lub Dub Sound Portable -

The rhythmic "lub-dub" sound of a heartbeat is one of the most fundamental signs of life. While it may seem like a simple mechanical beat, it is actually a precisely timed acoustic event caused by the heart's valves snapping shut.

: Usually shorter, sharper, and higher-pitched than the first sound. Diagnostic Significance What causes your Lub-Dub heart sound? heartbeat lub dub sound