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Adrenaline

(aka Epinephrine) is a hormone and a neurotransmitter. It is secreted by the adrenal medulla. When released into the bloodstream it increases heart rate and stroke volume, dilates the pupils, and constricts arterioles in the skin and gut while dilating arterioles in leg muscles. Often listed as being the source of abnormal feats of strength or agility, or the trigger of super-human powers.

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