High Quality Content by WIKIPEDIA articles! Noradrenaline (BAN) (abbreviated NA or NAd) or norepinephrine (INN) (abbreviated norepi or NE) is a catecholamine with dual roles as a hormone and a neurotransmitter. As a stress hormone, norepinephrine affects parts of the brain where attention and responding actions are controlled. Along with epinephrine, norepinephrine also underlies the fight-or-flight response, directly increasing heart rate, triggering the release of glucose from energy stores, and increasing blood flow to skeletal muscle. However, when norepinephrine acts as a drug it will increase blood pressure by its prominent increasing effects on the vascular tone from ?-adrenergic receptor activation.

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