Adrenergic is a term describing agents, receptors, or actions related to adrenaline (epinephrine) in the sympathetic nervous system. It denotes systems that respond to or mimic adrenaline, triggering fight-or-flight responses. In medicine, adrenergic drugs influence heart rate, vascular tone, and metabolic rate by acting on adrenergic receptors. The word is commonly used in pharmacology and physiology.
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