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Norepinephrine

Meaning

Norepinephrine, also known as noradrenaline, is a potent catecholamine that functions as both a hormone and a neurotransmitter within the central and peripheral nervous systems. As a hormone, it is primarily released from the adrenal medulla, playing a central role in the body’s sympathetic “fight-or-flight” response by increasing heart rate and mobilizing energy stores. As a neurotransmitter, it is essential for regulating vigilance, arousal, mood, and attention.