Relier Pairs CVS Heart: Cells & ECGVersion en ligne Pacemaker, Contractile cells & ECG par Dr MAHABOOB KHAN SULAIMAN 1 Ventricular depolarization 2 Pacemaker Cells 3 Non auto-rhythmic cells with long refractory period 4 Contractile cells 5 Funny current 6 Plateau phase 7 Auto-rhythmic 8 Ventricular repolarization 9 Atrial depolarization called pacemaker potential, Ca 'T' type channels open 1% of cells with no true resting potential QRS wave 99% cells with true resting potential characteristic of contractile cells, slow Ca channels open Contractile cells T wave Pacemaker cells P wave