<prompt> The phase of after depolarization is characterized by:Delayed entry of NaNa influx above zero potentialSlow closure of K channelsSlower net exit of K  <response>: The slower rate of repolarization toward the later pa has been described as After depolarization. The initial rate of repolarization is rapid. This is due to a greater concentration gradient for K to move out. However, as the K moves out, two things happen: Concentration gradient for K will narrow. Thus, rate of K efflux will decrease. The K that moved out will cause accumulation of positive charges carried by K just on the outside of the membrane. 