Heart Lub Dub Sound [portable] Link

The iconic "lub-dub" sound is the acoustic signature of a healthy heart in motion. Contrary to popular belief, these sounds aren't caused by the heart muscle contracting, but by the rhythmic closing of the heart's four valves as they manage blood flow.

From that day on, whenever Heartie beat, she smiled to herself, thinking: "Lub... dub... lub... dub... I'm doing my thing, and I'm loving every beat!" heart lub dub sound

The "lub-dub" sound is made by the heartbeat, specifically the closing of the heart's valves. Here's a simplified explanation: The iconic "lub-dub" sound is the acoustic signature