Every time a neuron fires an action potential, it must undergo a series of steps. Place the events that happen when a neuron fires into chronological order.
1) Depolarization of the neuron membrane
2) Repolarization of the neuron membrane
3) Hyperpolarization of the neuron membrane
4) Activation of voltage-gated sodium channels
5) Inactivation of voltage-gated sodium channels
6) Activation of voltage-gated potassium channels
7) Repolarization of the neuron membrane
8) Activation of voltage-gated calcium channels