norepinephrine

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norepinephrine

A doctor explains the role of norepinephrine in the human nervous system.

Definition
  1. Noun:
    • A neurotransmitter and hormone: Norepinephrine is a chemical substance that functions both as a neurotransmitter in the nervous system and as a hormone in the bloodstream.
    • A catecholamine: It is a specific type of organic compound (a catecholamine) that acts as a precursor in the biological synthesis of epinephrine (adrenaline).
    • A stress-response chemical: It is secreted by the adrenal medulla and released at nerve synapses, playing a key role in the body's "fight-or-flight" response, increasing alertness, focus, and heart rate.
Usage Examples
  • Noun:
    • The release of norepinephrine increases heart rate and blood pressure.
    • Some antidepressants work by affecting the reuptake of norepinephrine in the brain.
    • The adrenal glands secrete norepinephrine during stressful situations.
Advanced Usage
  • In medical/physiological contexts: Often discussed in relation to the sympathetic nervous system, stress, mood disorders, and cardiovascular function.
    • The study focused on norepinephrine levels in patients with panic disorder.
  • In pharmacology: Refers to a substance that can be administered as a medication (often called noradrenaline) to treat severe low blood pressure.
    • The patient was given an infusion of norepinephrine to support their blood pressure.
Variants and Related Words
  • Noradrenaline: The British English and common international pharmacological term for norepinephrine. They are chemically identical.
  • Catecholamine: The class of compounds to which norepinephrine belongs, also including dopamine and epinephrine.
  • Neurotransmitter: The general category for chemicals like norepinephrine that transmit signals across a synapse.
Synonyms
  • Noradrenaline (primary synonym, especially outside North America)
Related Compounds and Phrases
  • Norepinephrine reuptake inhibitor (NRI): A type of drug that increases norepinephrine levels by blocking its reabsorption into nerve cells.
    • The medication is a selective norepinephrine reuptake inhibitor.
  • Norepinephrine transporter (NET): The protein responsible for the reuptake of norepinephrine from the synapse.
norepinephrine

A doctor explains the role of norepinephrine in the human nervous system.

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

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