How does the drug levodopa contrast with dopamine? (Select all that apply.)
A) Levodopa is a precursor of dopamine.
B) Levodopa crosses the blood–brain barrier.
C) Levodopa is converted to dopamine.
D) Levodopa is effective for 8 to 10 years.
E) Dopamine returns to levodopa for metabolism.
A, B, C
Feedback:
Levodopa is a precursor of dopamine, which is deficient in parkinsonism; it crosses the blood–brain barrier, where it is converted to dopamine and acts as a replacement neurotransmitter; it is effective for 2 to 5 years in relieving the symptoms of Parkinson's disease.
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