A catecholamine that is the chemical means of transmission across synapses in postganglionic neurons of the sympathetic nervous system. In some parts of the central nervous system, it is a vasopressor hormone of the adrenal medulla and is a precursor of epinephrine in its major biosynthetic pathway. Norepinephrine is related to elation. If there isn't enough norepinephrine circulating, the resulting feeling is depression.
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