# At what stage of Neural transmission does calcium enter the cell through voltage-gated calcium channels?

Messages are transmitted through axa, the long tail-end of neurons, by ions flowing in and out of the cell. The electrical signal induces $N {a}^{+}$ ions to be pumped into the relatively negative cytoplasm, which attracts the electronic nerve impulse. The sodium also stimulates potassium channels to pump potassium out of the cell, repolarising it, and stimulates sodium to be pumped into the cell further down. This has the effect of tying a note to a piece of string and pulling it down the street with a cartoon character chasing after it.
Calcium comes into play near the end of the cell in the axon terminal. When the impulse reaches the terminal, voltage-dependent ion channels open and allow $C {a}^{2 +}$ to flow into the cell.