<Li> Key: UCTWMZQNUQWSLP - VIFPVBQESA - N </Li> <Tr> <Th_colspan="2"> (verify) </Th> </Tr> <P> Adrenaline, also known as adrenalin or epinephrine, is a hormone, neurotransmitter, and medication . Epinephrine is normally produced by both the adrenal glands and certain neurons . It plays an important role in the fight - or - flight response by increasing blood flow to muscles, output of the heart, pupil dilation response, and blood sugar level . It does this by binding to alpha and beta receptors . It is found in many animals and some single cell organisms . Napoleon Cybulski first isolated epinephrine in 1895 . </P> <P> As a medication, it is used to treat a number of conditions including anaphylaxis, cardiac arrest, and superficial bleeding . Inhaled epinephrine may be used to improve the symptoms of croup . It may also be used for asthma when other treatments are not effective . It is given intravenously, by injection into a muscle, by inhalation, or by injection just under the skin . Common side effects include shakiness, anxiety, and sweating . A fast heart rate and high blood pressure may occur . Occasionally it may result in an abnormal heart rhythm . While the safety of its use during pregnancy and breastfeeding is unclear, the benefits to the mother must be taken into account . </P>

Where does adrenaline come from in the body