What is an action potential

A)  an electrical signal that travels along the axon of a neuron 
B)  the small gap that exists between adjacent neurons 
C)  the tiny electrical charge that exists when a neuron is neither receiving nor sending information 
D)  the release of neurotransmitters

Electrical Signal

An impulse or transmission of information conveyed through the movement of electrical charge.

Axon

An elongated, thin extension of a neuron, also known as a nerve cell, which usually transmits electrical signals from the cell body of the neuron.

Action Potential

A temporary reversal of the electrical potential across the membrane of a neuron, leading to the transmission of an electrical signal along the neuron.