Final answer:
Parkinson's disease is a degenerative disorder that affects the muscular system and movement. It is characterized by tremors, rigidity, slow shuffling gait, stooped posture, poor balance, mask-like expression, and pill-rolling. Difficulty walking and cognitive symptoms may develop in advanced stages.
Step-by-step explanation:
Parkinson's disease is a degenerative disorder of the central nervous system that mainly affects the muscular system and movement. The four motor signs and symptoms of Parkinson's disease include tremors, rigidity, slow shuffling gait, stooped posture, poor balance, mask-like expression, and pill-rolling. Tremor is the most common and obvious symptom, occurring in a limb at rest. Difficulty walking and cognitive symptoms like dementia and depression may develop in the advanced stages of the disease.