As much as __________ of the substantia nigra may destroyed without symptoms of Parkinson's disease.
A)20%
B)40%
C)60%
D)80%
E)99%

Name: As much as __________ of the substantia nigra may destroyed without symptoms of Parkinson's disease. A)20% B)40% C)60% D)80% E)99%
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Question

Quizplus · Accepted Answer

Up to 80% of the substantia nigra can be destroyed before symptoms of Parkinson's disease become apparent, due to the brain's ability to compensate for the loss of dopamine-producing neurons.

As Much as __________ of the Substantia Nigra May Destroyed