A word is one or more sounds that in combination have a specific meaning assigned by a language. The symbolic meaning of words can be so powerful that people are willing to risk their lives for them or take the lives of others.
A nerve impulse is the relaying of a coded signal from a nerve cell to an effector (a muscle cell, a gland cell or another nerve cell) in response to a stimulus. It is the means by which a nerve cell communicates with another cell.
-also known as a nerve impulse is when the membrane potential conducts an impulse. ( not at rest anymore, something trigger electrical impulse on membrane) -When an adequate amount of stimulus excites the membrane, stimulus-gated sodium (Na+) channels open, allowing Na+ to diffuse into the cell at a very fast rate.