Adrenaline
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A hormone produced by the adrenal medulla in mammals. It can be produced synthetically for medical purposes. It is secreted by the adrenal medulla in response to low blood glucose, exercise and stress and causes a breakdown of glycogen to glucose in the liver, encourages the release of fatty acids from adipose tissue, causes vasodilation of the small arteries within muscle and increases cardiac output.
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"i've had an adrenaline rush, it's so common, you can google it."
gaaah. whew. i want bunjee jumping. :3