| A | B |
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| Action Potential | A momentary reversal in electrical potential across a plasma membrane that occurs when a cell has been activated by a stimulus. |
| Axon | A long nerve cell process that conducts impulses away from the cell body. |
| Dendrite | Any of the usually branching protoplasmic processes that conduct impulses toward the body of a neuron. |
| Ion | An atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained electrons |
| Myelin sheath | an insulating coat of nueron's cell membrane from Schwann cells |
| Neurologist | A physician skilled in the diagnosis and treatment of disease of the nervous system. |
| Neuron | A nerve cell; the fundamental unit of the nervous system that conducts signals |
| Neurotransmitter | A substance that transmits nerve impulses across a synapse |
| Reaction Time | The time elapsing between the beginning of the application of a stimulus and the beginning of an organism's reaction to it |
| Reflex | An automatic and often inborn response to a stimulus that involves a nerve impulse passing inward from a receptor to the spinal cord and thence outward to an effector (as a muscle or gland) without reaching the level of consciousness and often without passing to the brain. |
| Synapse | The place at which a nervous impulse passes from one neuron to another. |
