Epinephrine vs. Norepinephrine

Epinephrinenoun

A catecholamine hormone and neurotransmitter; as a hormone, secreted by the adrenal gland in response to stress (when it stimulates the autonomic nervous system); as a neurotransmitter, synthesized from norepinephrine.

Epinephrinenoun

a catecholamine secreted by the adrenal medulla in response to stress (trade name Adrenalin); stimulates autonomic nerve action

Norepinephrinenoun

(neurotransmitter) A neurotransmitter found in the locus coeruleus which is synthesized from dopamine.

Norepinephrinenoun

A hormone (C8H11NO3) secreted by the adrenal medulla; it also serves as a neurotransmitter, released at synapses; called also noradrenaline. Chemically it is 2-amino-1-(3,4-dihydroxyphenyl)ethanol. It is a precursor of epinephrine in the body.

Norepinephrinenoun

a catecholamine precursor of epinephrine that is secreted by the adrenal medulla and also released at synapses

Norepinephrine

Norepinephrine (NE), also called noradrenaline (NA) or noradrenalin, is an organic chemical in the catecholamine family that functions in the brain and body as both a hormone and neurotransmitter. The name , derived from Latin roots meaning , is more commonly used in the United Kingdom; in the United States, , derived from Greek roots having that same meaning, is usually preferred.