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