Final answer:
Three examples of nervous system disorders are Multiple Sclerosis, Alzheimer's Disease, and Parkinson's Disease. Multiple Sclerosis is caused by the breakdown of myelin sheaths, Alzheimer's Disease affects memory and behavior, and Parkinson's Disease is caused by the loss of dopamine-producing cells.
Step-by-step explanation:
1. Multiple Sclerosis
- Cause: Multiple sclerosis is an autoimmune disease in which the immune system mistakenly attacks the protective covering of nerve fibers, called myelin. The exact cause is unknown, but it is believed to involve a combination of genetic and environmental factors.
- Symptoms: The symptoms of multiple sclerosis can vary widely but may include fatigue, difficulty walking, numbness or tingling in the limbs, muscle weakness, problems with coordination, and problems with balance and vision.
2. Alzheimer's Disease
- Cause: Alzheimer's disease is a progressive brain disorder that affects memory, thinking, and behavior. The exact cause is unknown, but researchers believe that a combination of genetic, environmental, and lifestyle factors may play a role.
- Symptoms: The early symptoms of Alzheimer's disease may include memory loss, confusion, difficulty performing familiar tasks, changes in mood or personality, and difficulty communicating.
3. Parkinson's Disease
- Cause: Parkinson's disease is a neurodegenerative disorder caused by the loss of dopamine-producing cells in the brain. The exact cause is unknown, but both genetic and environmental factors are believed to play a role.
- Symptoms: The main symptoms of Parkinson's disease include tremors, rigidity, slow movement, and impaired balance and coordination. Other symptoms may include speech and swallowing difficulties, mood changes, and problems with memory and thinking.