Discussion
A neurotransmitter required for normal brain functioning but is affected in parkinson's disease is -
Answer: D
The neurotransmitter is dopamine.
Parkinson's disease results from the loss of dopamine-producing nerve cells in the substantia nigra of the midbrain. Without enough dopamine, the brain cannot control movement smoothly, causing tremor, rigidity and slowness. Treatment with levodopa works by replacing dopamine.
Insulin is a pancreatic hormone that lowers blood sugar, and oxytocin and prolactin are pituitary hormones concerned with childbirth and milk production. None of them is the neurotransmitter lost in Parkinson's disease.
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