Charles has been thinking about a friend who told him she has been diagnosed with multiple sclerosis. Charles knows from psychology class that multiple sclerosis causes damage to , which can lead to fatigue, trouble with vision, and cognitive disabilities.

myelin protective sheath that covers the nerve fibers (myelination)

Explanation:

Multiple sclerosis (MS) is a potentially disabling disease of the brain and spinal cord (central nervous system). In MS , the immune system attacks the protective sheath (myelin) that covers nerve fibers and causes communication problems between your brain and the rest of your body.

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