Final answer:
Dopamine is implicated in Parkinson's disease where its deficit leads to motor control symptoms, and it can cause schizophrenia when present in excess. Treatment for Parkinson's aims to increase dopamine levels to manage symptoms. so, option b is the correct answer.
Step-by-step explanation:
Too little dopamine can cause the shaking and muscle tremors of Parkinson's disease, while too much of this neurotransmitter can cause schizophrenia. Parkinson's disease is a neurodegenerative disorder caused by the progressive death of dopaminergic neurons in the substantia nigra, leading to symptoms such as tremors, slowed movement, speech changes, balance and posture problems, and rigid muscles. Treatments focus on increasing dopamine levels, most commonly using L-DOPA, to alleviate symptoms.
Too little dopamine can cause the shaking and muscle tremors of Parkinson's disease, while too much of this neurotransmitter can cause schizophrenia. Parkinson's disease is a neurodegenerative disease that causes the loss of dopamine neurons in the substantia nigra, a midbrain structure that regulates movement. Loss of these neurons leads to symptoms such as tremor, slowed movement, speech changes, balance and posture problems, and rigid muscles. On the other hand, excessive dopamine levels in the brain are associated with schizophrenia.