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