Adrenaline
Sorry, this answer is incorrect. Adrenaline is a hormone and a neurotransmitter, not a high-energy compound as is ATP. It is 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 the production of glucose, constricting arterioles in the skin and gut while dilating arterioles in leg muscles.