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. And the same thing is true here. So as this inside becomes more positive, this inside also begins to become more positive. And so as this, as these ions begin to close, these sodium ions will begin to open.