Epinephrine, also known as adrenaline, is a hormone and neurotransmitter that plays a crucial role in the body's "fight-or-flight" response. It is produced by the adrenal glands and released into the bloodstream in response to stress or danger. Epinephrine causes a number of physiological changes, including increased heart rate, blood pressure, and respiration. It also dilates the airways and pupils, and increases blood flow to the muscles.
Epinephrine is used in a variety of medical applications, including the treatment of allergic reactions, asthma, and cardiac arrest. It is also used as a local anesthetic in dentistry.