noun
a hormone secreted by the adrenal glands that increases rates of blood circulation, breathing, and carbohydrate metabolism and prepares muscles for exertion.
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The doctor explained how the release of adrenaline can affect the body's fight or flight response.
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I always get a rush of adrenaline before going on a roller coaster.
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I was so pumped full of adrenaline during the concert, I couldn't stop dancing.
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The adrenaline of competition fueled her drive to succeed.