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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 the darker-stained fibers on a basic ATPase stain of skeletal muscle
 
        B) They contain fewer mitochondria than type II fibers
 
        C) They are the primary muscle fibers affected in steroid-induced myopathy
 
        D) They have a higher capacity for oxidative metabolism than type II fibers
 
        E) They are associated with larger motor neurons than 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 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.
Reload this question to learn more stuff about muscle fiber types.  (See References)

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B) 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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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.
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D) they have a higher capacity for oxidative metabolism than type II fibers

This answer is correct.


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 associated with larger motor neurons than type II fibers

This answer is incorrect.


Type I fibers are associated with smaller motor neurons. Type II fibers are associated with larger motor neurons.
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

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