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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.
In beta cells of the pancreas, they provoke release of insulin. Action potentials in neurons are also known as  nerve impulses  or spikes, and the temporal sequence of action potentials generated by a neuron is called its  spike train .A neuron that emits an action potential is often said to fire.everal types of cells support an action potential, such as plant cells, muscle cells, and the specialized cells of the heart (in which occurs the cardiac action potential). However, the main excitable cell is the neuron, which also has the simplest mechanism for the action potential.