Parkinson's disease results from a reduction in dopamine in the brain; therefore, it would seem that the likely treatment would be to administer dopamine. Why doesn't this treatment work?
a) The blood-brain barrier prevents dopamine from entering the brain.
b) The digestive tract destroys dopamine before it can get to the brain.
c) There are no known sources of dopamine for use in such a proposed treatment.
d) The surgical intervention that must be done is more dangerous than the disease.
ANS: a
Psychology
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