𝚔𝚒𝚍𝚅𝙰𝙼𝙿𝙸𝚁𝙴

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...

1. Comunidade
2. Study Group
3. Heart beat