So we have depolarization taking place here and repolarization taking place here. Now in this same effect, so we basically have a domino effect taking place. And so each adjacent consecutive region will basically be depolarized as our action potential moves along our cell membrane. Now, the next question that we want to basically answer is why doesn't our action potential move in the opposite direction? So we said earlier that as the positive charge increases on this side, this inside negative charge becomes more positive. And that's exactly why what causes this section to depolarize.