Definition of norepinephrine
: a monoamine C8H11NO3 that is a neurotransmitter in postganglionic neurons of the sympathetic nervous system and in some parts of the central nervous system, is a vasopressor hormone of the adrenal medulla, and is a precursor of epinephrine in its major biosynthetic pathway
Recent Examples of norepinephrine from the Web
Caffeine prompts the release of natural compounds called catecholamines, including norepinephrine, a stress hormone that can speed the heart rate.
Exercise also increases concentrations of norepinephrine, which helps the brain’s response to stress.
As people fall in love, the brain begins to release the hormones dopamine, norepinephrine, and serotonin.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'norepinephrine.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use of norepinephrine
Medical Definition of norepinephrine
: a catecholamine C8H11NO3 that is the chemical means of transmission across synapses in postganglionic neurons of the sympathetic nervous system and in some parts of the central nervous system, is a vasopressor hormone of the adrenal medulla, and is a precursor of epinephrine in its major biosynthetic pathway—called also arterenol, noradrenaline; see levophed
Learn More about norepinephrine
Britannica.com: Encyclopedia article about norepinephrine
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