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Definitions N

narcosis. A state of stupor, often induced by drugs or other agents.

nerve. A bundle of fibers that connect the brain and spinal cord with various parts of the body and through which impulses containing information pass.

nervous breakdown. A nonmedical term sometimes used by the public to describe an episode of overwhelming distress or depression.
 

neuron. A single nerve cell.

neurotransmitters. Naturally occurring chemicals in the brain that act as messengers between nerve cells, affecting brain function and mood. Those associated with depression include serotonin, norepinephrine and dopamine. Neurotransmitters serve as data messengers, transmitting information from one nerve cell (neuron) to another across a gap called a synapse.

nicotine. An addictive chemical found in tobacco.

noradrenaline. A naturally occurring hormone that increases heart rate and blood pressure and affects other body functions. Also called norepinephrine.

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