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Lesia Marie. A nerve impulse is an electrical charge that travels down the cell membrane of a neuron's dendrite and/or axon through the action of the Na-K pump. The inside of a neuron's cell membrane is negatively-charged while the outside is positively-charged. It is called Action potential.
Action Potential Explained - The Neuron. An Action potential is the neurons way of transporting electrical signals from one cell to the next. This is a picture of a neuron, where you have dendrites in one end, and the axon terminal in the other end. In the middle of the neuron you will find the axon, which is where the electrical signal will travel from the dendrites to the axon terminal to the synapse.