LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Norepinephrine neurotransmitter molecule. Computer model showing the structure of the neurotransmitter and hormone norepinephrine, or noradrenaline. Atoms are colour-coded spheres (carbon: dark grey, hydrogen: light grey, oxygen: red, and nitrogen: blue). Norepinphrine is part of the 'fight-or-flight' response, where it increases heart rate, triggering the release of glucose from energy stores, and increasing blood flow to skeletal muscle. It is also used as an emergency drug to restore dangerously low blood pressure or to treat cardiac arrest.
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