JOHN BAVOSI / SCIENCE PHOTO LIBRARY JOHN BAVOSI / SCIENCE PHOTO LIBRARY
Dopamine brain chemistry. Artwork of a molecule of dopamine (upper right), a human brain (centre left; seen from the side, front at left) and a nerve synapse (upper left). Dopamine (C8.H11.N.O2) consists of atoms (spheres) of hydrogen (green), oxygen (red), carbon (black) and nitrogen (pink). It is a neurotransmitter (small red spheres), transmitting signals between nerves at a nerve cell junction (synapse). Dopamine plays an important role in brain chemistry, and its underproduction causes Parkinson's disease, while excess may cause paranoia and other mental illnesses. The brain's limbic system (pink) is an area rich in dopamine.
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