What impact does Parkinson's disease have on the nervous system?

• A. It enhances coordination and movement
• B. It leads to tremors and rigidity
• C. It causes severe headaches
• D. It affects sensory perception

Answer: (B)

Parkinson's disease primarily affects the nervous system by leading to tremors and rigidity, which are hallmark symptoms of this condition. This neurodegenerative disorder primarily impacts the basal ganglia, a group of structures involved in movement control. As dopamine-producing neurons in this area of the brain degenerate, patients experience a diminished ability to initiate and regulate movements smoothly.

Tremors often manifest as involuntary shaking, particularly in the hands, while rigidity refers to the stiffness and resistance to movement in muscles. This combination significantly impairs the coordination and fluidity of movement, leading to difficulties in daily activities and affecting overall quality of life.

While other aspects of the nervous system can be impacted by Parkinson's, such as posture and balance, the defining symptoms of tremors and rigidity are what most clearly characterize the disease's impact, making this the correct choice.