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Sorry, this answer is incorrect. Adrenaline is a hormone and a neurotransmitter secreted by the medulla of the adrenal glands in response to a stressful situation. This hormone, also known as the "flight or fight" hormone, prepares the body for strenuous activity by increasing the heart rate and stroke volume, constricting arterioles in the skin and gut while dilating arterioles in leg muscles. It also affects the storage and mobilization of fatty acids and glycogen; it increases the hydrolysis of glycogen to glucose in the liver and thereby raises the blood sugar levels. In emergency medicine, adrenaline is used for resuscitation in the case of shock and cardiac arrest.
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