Which body systems does parkinson's disease affect?

The cns: The cause of pakinsons is the degeneration of Dopamine producing cells in the mid brain. The cause is unknown. This causes movement and gait disturbances tremors etc.

Parkinson's disease: Parkinson's disease is a degenerative disorder of the brain where the production of Dopamine by specialized nerve cells is impaired. This results in significant motor function impairment (tremors, rigidity, slowing if movements and gait or balance difficulties). Other areas may, to a lesser degree, be involved as well (mood, cognitive, autonomic nervous system).