Interatrial sinoatrial(SA)node (AV) node Threshold potental Faster rate of Internodal Len depolarization branch Time (msec) br△nch atrioventricular(Av) node ventricle Threshold Slower rate depolarization Time(mse Slow response pacemakers in sinoatrial (SA) node and atrioventricular (AV) nodeSlow response pacemakers in sinoatrial (SA) node and atrioventricular (AV) node sinoatrial (SA) node atrioventricular (AV) node