BSIP ROUX / SCIENCE PHOTO LIBRARY BSIP ROUX / SCIENCE PHOTO LIBRARY
Parkinson's disease. Man reading a newspaper with trembling hands due to the effects of Parkinson's disease. The disease is caused by the loss of nerve cells from the brain's basal ganglia. Healthy basal ganglia produce dopamine, a neurotransmitter, that helps to control muscle contraction. However, in Parkinson's disease there is a lack of dopamine, resulting in jerky, involuntary movements. While treatments reduce the symptoms they do not stop the disease's progress.
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