Hormones: Adrenaline
Adrenaline is a hormone released from the adrenal glands and its major action, together with noradrenaline, is to prepare the body for fight or flight. Alternative names for adrenaline Epinephrine. Image of an eye showing a dilated or enlarged pupil - one of the effects of adrenaline released during a "fight or flight" response. What is adrenaline? Adrenaline and noradrenline are two separate but related hormones and neurotransmitters. They are produced in the medulla of the adrenal glands and in some neurons of the central nervous system. They are released into the bloodstream and serve as chemical mediators, and also convey the nerve impulses to various organs. Adrenaline has many different actions depending on the type of cells it is acting upon. However, the overall effect of adrenaline is to prepare the body for the ‘fight or fli...