𝚔𝚒𝚍𝚅𝙰𝙼𝙿𝙸𝚁𝙴

1. Community
2. Study Group
3. Heart beat

A heartbeat is a coordinated, electrical, and muscular process driven by the sinoatrial (SA) node (the heart's pacemaker), which sends electrical impulses causing the upper chambers (atria) to cont...