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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 have a lower capacity for anaerobic metabolism than type II fibers
 
        B) They are the primary muscle fibers affected in steroid-induced myopathy
 
        C) They are the lighter-stained fibers on an acidic ATPase stain of skeletal muscle
 
        D) They are the primary muscle fibers affected in hyperthyroid myopathy
 
        E) They comprise the "white meat" in your Thanksgiving turkey
 

 


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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 have a lower capacity for anaerobic 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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B) 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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C) they are the lighter-stained fibers on an acidic ATPase stain of skeletal muscle

This answer is incorrect.


Type I muscle fibers are the darker-stained fibers on a pH 4.2 (acidic) ATPase stain of skeletal muscle. Type II fibers appear lighter in this staining technique.
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D) they are the primary muscle fibers affected in hyperthyroid myopathy

This answer is incorrect.


In hyperthyroid 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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E) 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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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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