The symptoms of Parkinson's disease are temporarily alleviated in some patients by injections of

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Quizplus · Accepted Answer

Parkinson's disease is characterized by a lack of dopamine production in the brain, which leads to motor dysfunction. L-DOPA, a precursor of dopamine, can cross the blood-brain barrier and be converted into dopamine to temporarily alleviate symptoms. Tyrosine is also a precursor to dopamine, but it does not cross the blood-brain barrier as easily as L-DOPA. Dopamine itself cannot be administered directly because it does not cross the blood-brain barrier. Serotonin and adrenaline are not involved in the dopamine production pathway and would not alleviate Parkinson's symptoms.

The Symptoms of Parkinson's Disease Are Temporarily Alleviated in Some