Epinephrine and norepinephrine are the other names for adrenaline and noradrenaline, respectively. The sympathetic nervous system is stimulated by the hormone adrenaline. It prepares the body for any situation that may arise. Fear, sweating, shivering, and other physical reactions are all caused by adrenaline secretion. All of these responses improve oxygen flow to muscular tissues for breathing, allowing more energy to be released for either flight or fight. As a result, adrenaline gives the body the ability to deal with any stress or disaster. As a result, it's also known as the "emergency hormone."