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