ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Adrenaline. Computer illustration of a molecule of the hormone adrenaline, or epinephrine. Atoms are spheres: the small atoms are hydrogen (H), while the large atoms are carbon (C), nitrogen (N) and oxygen (O). Adrenaline (chemical formula C9H13NO3) is a hormone produced in the adrenal glands above the kidneys. It is released at times of stress or fear to allow the body to work harder for a short time, leading to a 'fight or flight' response. It increases the speed and force of the heartbeat, widens the airways to allow the lungs to take in more oxygen and directs blood to the muscles to allow them to work harder. As a drug, it is used to treat severe asthma and shock.
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