Multiple Sclerosis Is a Result of

question 29

Multiple Choice

Multiple sclerosis is a result of

• A)excess amounts of myelin on nerve cells.
• B)an immune system attack on nerve fibers.
• C)the absence of myelin on nerve cells.
• D)blocking the nodes on Ranvier.
• E)having excess acetylcholine receptors.

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Definitions:

Debris Avalanche

A high-velocity flow of soil, sediment, and rock, commonly from the collapse of a steep mountainside.

Permafrost

Permanently frozen ground that occurs in high latitude regions of the Earth, consisting of soil, gravel, and sand usually bound together by ice.

Rock Fall

A mass-wasting process whereby large rocks and smaller pieces of bedrock detach and fall onto the ground.

Scarp

A steep slope or cliff, especially at the edge of a plateau or separating areas of land at different elevations.