Figure 2From: Repolarization of the action potential enabled by Na+ channel deactivation in PSpice simulation of cardiac muscle propagationRecords showing how variations in the delay time (RC time constant), controlling the activation of the second black box (BB-2), affected the duration of the action potentials (APD50). The records were obtained with propagation in a chain of 10 cells. Shortening the delay time produced shortening of the APD50.Back to article page