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.
A nerve impulse begins when an individual neuron receives a stimulus that enables the action potential threshold to be reached (around -50mv).The stimulus is specific for the neural receptor. In other words, a light receptor is stimulated by a particular quantity of light energy.t is the firing of a nerve which sends an electrical signal down  the axons of that nerve. The message propagates by the movement of  Sodium (Na) and Potassium (K) ions in â¦ and out of the axon  wall/sheath.