Place the electrical events of the cardiac cycle in chronological order from the period of electrical rest during ventricular diastole to the start of the ventricular systole. electrical rest during ventricular diastole a depolarizing current flows through the AV bundle a wave of depolarization sweeps across the atria a depolarizing current flows through the right and left bundle branches a depolarizing current reaches ventricular contractile cells via the subendocardial conducting network (purkinje fibers) the AV node depolarizes pacemaker cells of the AV node depolarize start of ventricular systole.