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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 comprise the "white meat" in your Thanksgiving turkey
 
        B) There is no relation between muscle fiber type and the relative size of associated motor neurons
 
        C) They are slow-twitch fibers
 
        D) They have about the same capacity for oxidative metabolism as type II fibers
 
        E) They are the darker-stained fibers on a basic ATPase stain of skeletal muscle
 

 


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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 comprise the "white meat" in your Thanksgiving turkey

This answer is incorrect.


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.
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B) there is no relation between muscle fiber type and the relative size of associated motor neurons

This answer is incorrect.


Type I fibers are associated with smaller motor neurons. Type II fibers are associated with larger motor neurons.
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C) 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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D) they have about the same capacity for oxidative metabolism as 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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E) they are the darker-stained fibers on a basic ATPase stain of skeletal muscle

This answer is incorrect.


Type I muscle fibers are the lighter-stained fibers on a pH 9.4 (basic) ATPase stain of skeletal muscle. Although in the basic stain, type I fibers may still appear fairly dark, type II fibers appear even darker in this staining technique.
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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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