The administration of dopamine as a drug is not an effective method of treating Parkinsonism because:
A) dopamine is quickly metabolized to an inactive compound in the liver.
B) dopamine is too large to be absorbed by the intestines.
C) dopamine does not readily cross the blood-brain barrier to enter the brain.
D) dopamine is quickly inactivated in the blood through enzymatic activity.
Correct Answer:
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