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Understanding the Physiology of Health and Illness

Multiple sclerosis, spinal cord injury and stroke

  • 3 things to know
  • AS 7

Overview

Plaque in multiple sclerosis, three difficulties a person living with multiple sclerosis may experience and relapsing–remitting multiple sclerosis.

What you need to know

Answer each one before you reveal it.

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Key term

Why is multiple sclerosis described as an autoimmune condition?

Key term

What is a plaque in multiple sclerosis?

Key term

Why does loss of myelin slow the nerve impulse?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What happens to the nervous system in multiple sclerosis?

    Model answer

    In multiple sclerosis the immune system attacks the myelin around nerve fibres in the brain and spinal cord, so impulses are slowed or blocked.

  2. 2

    Why is multiple sclerosis described as an autoimmune condition?

    Model answer

    Multiple sclerosis is autoimmune because the person's own immune cells attack myelin, a normal part of their nervous system.

  3. 3

    What is a plaque in multiple sclerosis?

    Model answer

    A plaque in multiple sclerosis is a patch of scar tissue left where myelin has been stripped from nerve fibres.

  4. 4

    Why does loss of myelin slow the nerve impulse?

    Model answer

    Myelin insulates the axon and lets the impulse jump between nodes, so once myelin is lost the impulse travels far more slowly or fails altogether.

  5. 5

    Name three difficulties a person living with multiple sclerosis may experience.

    Model answer

    A person living with multiple sclerosis may experience overwhelming fatigue, problems with vision and difficulty walking.

  6. 6

    What is meant by relapsing–remitting multiple sclerosis?

    Model answer

    Relapsing–remitting multiple sclerosis is a pattern in which symptoms flare for a period and then partly or wholly settle again.

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