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Parkinson’s disease (characterized by tremors and progressive rigidity of limbs) is caused by degeneration of brain neurons that are involved in movement control and make use of neurotransmitter

1. acetylcholine
2. norepinephrine
3. dopamine
4. GABA

Correct answer: dopamine

Solution

Parkinson’s disease results from degeneration of dopaminergic neurons, especially in the substantia nigra. Loss of dopamine disrupts normal movement control, leading to tremor, rigidity, and slowed movement.

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