Within the center's upper ideal chamber is a group of cells called the sinus node. The sinus node is the center's purely natural pacemaker. It creates the signal that begins Every single heartbeat. Bradycardia happens when these signals decelerate or are blocked. Comisia de la Veneția, raport pe anularea https://coingenius.news/adva-unveils-the-eprc-optical-cesium-atomic-clock-solution-to-help-sps-combat-gnss-outages/