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.
4. Nerve impulses then are electrical signals created by the movement of ions across the neuron cell membrane in response to some stimulus. 5. Due to the nature of the phospholipid bilayer, ions must cross cell membranes by way of specific ion channels, constructed of membrane proteins.