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            Parkinson's disease affects nearly one percent of the population that is of the age of 60 in the US. This disease has shown to be more common among men than among women and is more widespread in northern countries. The occurrence of this disease increases with age, yet aging itself is not believed to be a factor. It has shown to be seldomly inherited and actually less than a percent of cases are thought to be a result of a genetic inherent (Larsen, 2002). .
             Symptoms of Parkinson's occur because this condition slowly but surely kills nerve cells that release dopamine. It carries many messages from one nerve cell to the next. A loss of dopamine messes up communication pathways of nerves that aid in controlling movement. As the cells die, patients have more and more difficulty controlling and performing certain movements. A person with this disease would oftentimes walk with a shuffle with face muscles growing firm, which causes a "masklike" expression. .
             Doctors do not know what causes Parkinson's disease and are still striving for an answer. Many people believe that it is inherited, but this statement is false in most cases. Scientists believe that it is most likely caused from Environmental and Dietary Factors. Symptoms of Parkinson's can occur as a result of head injuries, carbon monoxide poisoning, or poisoning by medical drugs (Hawaleshka, 2002). .
             There are many symptoms that occur in Parkinson's Disease, but most patients do not experience a full range of symptoms. One symptom, Rigidity, is an expanding tone of stiffness of the muscles. This symptom is always present unless eased by anti-Parkinson's medication. When a patient moves with this symptom, it increases and leads to pain in the arms and soldiers. Secondly, Tremor, when present, could be worse on one side of the body than the other. It not only effects the limbs but sometimes the head, neck, face, and jaw. Next, Bradykinesia, or slowness of movement, is shown by a delay in starting movements.

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