Lub-dub Sounds 'link'

It marks the moment your heart begins to rest and refuel. Why the Rhythm Matters

In simple terms, the "lub-dub" is the sound of your heart valves snapping shut. lub-dub sounds

These are "whooshing" or "swishing" sounds caused by turbulent blood flow. This might mean a valve isn't closing tightly enough (regurgitation) or is too stiff to open fully (stenosis). It marks the moment your heart begins to rest and refuel