How the Heart Beats · Heart
Heart sounds are valve doors closing.
That familiar lub-DUB you can hear? It's mainly the sound of your heart valves snapping shut — not your heart hitting your chest.
There's more: heart sounds are valve doors closing. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
Body Atlas is an educational product. It does not provide diagnosis, treatment, or personal medical advice. · Privacy