Type I Muscle Fibers

Topic: Physiology

Created on Sunday, November 9 2008 by jdmiles

Last modified on Sunday, November 9 2008.

 
        A) They contain about the same number of mitochondria as type II fibers
 
        B) They are the primary muscle fibers affected in disuse atrophy
 
        C) They are the primary muscle fibers affected in steroid-induced myopathy
 
        D) They comprise the "dark meat" in your Thanksgiving turkey
 
        E) They are fast-twitch fibers
 

 

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This question was created on November 09, 2008 by jdmiles.
This question was last modified on November 09, 2008.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS

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A) they contain about the same number of mitochondria as type II fibers

This answer is incorrect.

Type I fibers contain more mitochondria than type II fibers.
Reload this question to learn more stuff about muscle fiber types.  (See References)

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B) they are the primary muscle fibers affected in disuse atrophy

This answer is incorrect.

In disuse atrophy, there is selective atrophy of type II muscle fibers.
Reload this question to learn more stuff about muscle fiber types.  (See References)

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C) they are the primary muscle fibers affected in steroid-induced myopathy

This answer is incorrect.

In steroid-induced myopathy, there is selective atrophy of type II muscle fibers.
Reload this question to learn more stuff about muscle fiber types.  (See References)

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D) they comprise the "dark meat" in your Thanksgiving turkey

This answer is correct.

Type I muscle fibers are redder in color, whereas type II muscle fibers are whiter in color. This corresponds somewhat to the "white meat" and "dark meat" seen in poultry.
Reload this question to learn more stuff about muscle fiber types.  (See References)

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E) they are fast-twitch fibers

This answer is incorrect.

Type I fibers are also referred to as "slow-twitch" fibers. Type II fibers are referred to as "fast-twitch" fibers.
Reload this question to learn more stuff about muscle fiber types.  (See References)

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References:

1. Preston, D.C., and Shapiro, B.E. (2005). Electromyography and Neuromuscular Disorders: Clinical-Electrophysiologic Correlations, 2nd Edition. Elsevier, Philadelphia. (ISBN:075067492X)	Advertising:
2. Nizar Souayah, Sami Khella. Neurology: McGraw-Hill specialty board review: examination & board review. New York : McGraw-Hill, Medical Pub. Division, c2005. (ISBN:0071378391)	Advertising:
3. Prayson, R.A., and Goldblum, J.R. (Eds.) (2005). Neuropathology. Elsevier Churchill Livingstone, Philadelphia. (ISBN:0443066582)	Advertising:

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physiology
Type I Muscle Fibers
Question ID: 110908126
Question written by J. Douglas Miles, (C) 2006-2009, all rights reserved.
Created: 11/09/2008
Modified: 11/09/2008
Estimated Permutations: 5140800