Final answer:
Parkinson's disease is a degenerative disorder of the central nervous system that affects the muscular system and movement. It is characterized by the loss of dopamine neurons, leading to symptoms such as tremors and rigid muscles.
Step-by-step explanation:
Parkinson's disease is a degenerative disorder of the central nervous system that mainly affects the muscular system and movement. It occurs because of the death of neurons in the midbrain, specifically the loss of dopamine neurons in the substantia nigra.
This loss of dopamine neurons results in symptoms such as tremors, slowed movement, speech changes, balance and posture problems, and rigid muscles.