What is happening to the electrical potential of a neuron when it generates an action potential?

the resting potential is when the neurons are not conducting any impulses. at this time, the electrical potential is -70mV

during action potential, the sodium ion gated channel opened and sodium ions diffuse into the neuron according to the concentration gradient. depolarization happened and the neuron become increasingly positive. at this point it is +35mV.

action potential happened to generate impulse.

The function of the action potential is to carry an electrical signal from the cell body down the axon to synaptic terminals where the depolarization induces a calcium influx that triggers synaptic vessicle fusion and neurotransmitter release.

What happens is that the depolarization of the neuron above a certain threshold causes fast activating voltage gated sodium channels to open, allowing sodium to flow into the cell, further depolarizing the cell. At the same time, slowly activating potassium channels start to open, and let potassium flow out of the cell, hyperpolarizing the neuron. At the same time, both types of voltage activated channel start to deactivate above the threshold voltage, and eventually enter a closed state. The end result is a rapid depolarization caused by sodium influx through sodium selective voltage gated channels, and a slower hyperpolarization due to potassium selectived voltage gated channels.