How the Heart Beats · Heart
Your built-in pacemaker — every beat starts here.
Every heartbeat starts with a tiny electrical signal. The spot in your heart that sends it is called the sinoatrial (SA) node — your natural pacemaker.
There's more: your built-in pacemaker — every beat starts here. 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