Surprisingly, the symptoms of Parkinson's disease do not typically emerge until ______% of the neurons in the substantia nigra are lost.

Question

Quizplus · Accepted Answer

Symptoms of Parkinson's disease generally do not become apparent until about 60% of the dopaminergic neurons in the substantia nigra, a region of the brain critical for movement control, are lost. This significant loss of neurons leads to the characteristic symptoms of Parkinson's disease, such as tremors, stiffness, and bradykinesia (slowness of movement).

Surprisingly, the Symptoms of Parkinson's Disease Do Not Typically Emerge