Adrenalin (Epinephrine)

A hormone, which is excreted from the Adrenal gland. It is known as “stress” hormone, because its secretion increases during stress and exertion. It causes changes in the body, such as accelerated pulse rate, dilatation of the pupils, and increased blood flow into the muscles of the lower extremities. It is also dubbed danger hormone, and indeed the physical changes effected by it prepare the body to react in situations of threat (for example pumping more blood to the leg muscles prepares the body to flight). Used medically, the hormone serves for resuscitation, in Asthma (dilates bronchi), in surgery (constricts blood vessels and reduces bleeding) and more.