Dopamine is not an effective treatment for Parkinson's disease because
A) dopaminergic neurons are restricted to the PNS.
B) Parkinson's disease is a cholinergic dysfunction.
C) Parkinson's disease is a noradrenergic dysfunction.
D) d'Orta is the treatment of choice.
E) dopamine does not readily penetrate the blood-brain barrier.
Answer: E
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