Epinephrine, also known as ADRENALINE, is a HORMONE produced by the adrenal glands. It is a neurotransmitter that plays an important role in the body's fight-or-flight response. It is released in response to physical or psychological stress and helps to increase heart rate, blood pressure, and respiration. It also helps to increase the body's energy levels and alertness. Epinephrine is essential for maintaining homeostasis in the body and is involved in many physiological processes.