Observations of the Muscle Fibers of People Who Have Experienced

question 46

Multiple Choice

 Observations of the muscle fibers of people who have experienced spinal cord damage suggest that neural input is especially important to the maintenance of

• A) fast-twitch fibers.
• B) slow-twitch fibers.
• C) both fast- and slow-twitch fibers.
• D) neither fast- nor slow-twitch fibers.

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Definitions:

Arrector Pili

Small muscles connected to hair follicles that, when contracted, cause hair to stand up, producing 'goosebumps'.

Goose Bumps

The raising of small bumps on the skin due to the contraction of miniature muscles at the base of hair follicles, usually in response to cold or fear.

Hair Follicles

The skin organ that produces hair, consisting of a small tubular cavity containing the root of a hair and located in the dermis of the skin.

Nervous Tissue

Tissue that contains nerve cells (neurons), which conduct impulses, and neuroglia, which support, protect, and provide nutrients to neurons.