Norepinephrine is a neurotransmitter and hormone produced by the adrenal glands that plays a key role in the body's fight or flight response, increasing heart rate, blood pressure, and blood sugar levels. It also helps to regulate sleep cycles, attention, and memory functions.
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Adrenal glands: Endocrine glands located above the kidneys that release hormones like adrenaline and norepinephrine in response to stress.
Fight or flight response: A physiological reaction that occurs in response to a perceived harmful event, attack, or threat to survival; it prepares the body for rapid action.