Which neurotransmitter is primarily affected in Parkinson's disease?

• A. Dopamine
• B. Serotonin
• C. Norepinephrine
• D. Acetylcholine

Answer: (A)

The primary neurotransmitter affected in Parkinson's disease is dopamine. In Parkinson's disease, there is a progressive degeneration of dopaminergic neurons, particularly in the substantia nigra region of the brain, which is crucial for coordinating movement. Dopamine plays a key role in the regulation of motor control, and its deficiency leads to the hallmark symptoms of Parkinson's, including tremors, rigidity, and bradykinesia (slowness of movement).

Understanding the role of dopamine is essential as it directly impacts the motor pathways involved in movement and coordination. The therapeutic approaches for managing Parkinson's disease often focus on restoring dopamine levels or mimicking its action to alleviate symptoms. This highlights the significance of dopamine in this condition and why it is the neurotransmitter primarily affected in Parkinson's disease.