The axon hillock has a cluster of sodium channels, which you mentioned were voltage gated. So the only thing that can open them is a change in volt. And as you mentioned, it has to be negative 55 to open them. As these all open, then we have this domino effect of all these sodium channels opening down the length on the axon until it gets to the bottom end towards the axon terminal. Now, we start to lose at this point the sodium voltage gated channels, and we start to see we get calcium channel, but they're voltagegated. That's right. The same thing as we saw with the sodium channels, but we just change