1.

Dopamine a neurotransmitter that is deficient in Parkinson's disease ​

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Explanation:

In Parkinson's disease, CERTAIN nerve cells (NEURONS) in the brain gradually break down or die. Many of the symptoms are due to a loss of neurons that produce a chemical messenger in your brain called DOPAMINE. When dopamine levels decrease, it CAUSES ABNORMAL brain activity, leading to symptoms of Parkinson's disease.



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