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Type I Muscle Fibers

Topic: Physiology

Created on Sunday, November 9 2008 by jdmiles

Last modified on Sunday, November 9 2008.

Which of the following statements about type I muscle fibers is most accurate?

 
        A) They are slow-twitch fibers
 
        B) They have a higher capacity for anaerobic metabolism than type II fibers
 
        C) They are the primary muscle fibers affected in disuse atrophy
 
        D) They contain fewer mitochondria than type II fibers
 
        E) They contain about the same number of mitochondria as type II 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




A) they are slow-twitch fibers

This answer is correct.


Type I fibers are also referred to as "slow-twitch" fibers. Type II fibers are referred to as "fast-twitch" fibers.
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B) they have a higher capacity for anaerobic metabolism than type II fibers

This answer is incorrect.


Type II muscle fibers have a higher capacity for oxidative metabolism than type II fibers, which have a higher capacity for anaerobic metabolism.

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C) 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.
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D) they contain fewer mitochondria than type II fibers

This answer is incorrect.


Type I fibers contain more mitochondria than type II fibers.
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E) 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.
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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

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