The ways in which the words can be meaningfully combined is defined by the language's syntax and grammar. The actual meaning of words and combinations of words is defined by the language's semantics.
A nerve impulse is an electrical signal that travels along an axon. There is an electrical difference between the inside of the axon and its surroundings, like a tiny battery. When the nerve is activated, there is a sudden change in the voltage across the wall of the axon, caused by the movement of ions in and out of the neuron.
Nerve. A nerve, on the other hand, is a bundle of axons or dendrites wrapped in connective tissue that conveys impulses between the central nervous system and some other parts of the body. A typical nerve has a tough outer covering, epineurium.t is the single neuron that transmit the action potential of a stimulus or the replying motor signal along the axons dendrites and the cell body whereas, the nerves simply covey the axons to and from the CNS.