1. A hormone and neurotransmitter produced by the adrenal glands and nerve cells that increases heart rate, blood pressure, and blood glucose levels; also called noradrenaline.
Usage: medical/scientific term; plural form of norepinephrine; commonly used in physiology and pharmacology

Examples

• Norepinephrines are released during the fight-or-flight response to prepare the body for action.
• The doctor explained that norepinephrines help regulate blood pressure and heart function.
• During stress, levels of norepinephrines increase in the bloodstream.
• Some antidepressants work by increasing norepinephrines in the brain.
• The sympathetic nervous system releases norepinephrines to mobilize energy reserves.