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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 fatigue rapidly
 
        B) They normally stain lighter than type II fibers on a cytochrome C oxidase stain of skeletal muscle
 
        C) They normally stain darker than type II fibers on a cytochrome C oxidase stain of skeletal muscle
 
        D) They contain fewer mitochondria than type II fibers
 
        E) They are lighter in color
 

 


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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 fatigue rapidly

This answer is incorrect.


Type I fibers are slow to fatigue.
Reload this question to learn more stuff about muscle fiber types.  (See References)

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B) they normally stain lighter than type II fibers on a cytochrome C oxidase stain of skeletal muscle

This answer is incorrect.


On a normal skeletal muscle biopsy prepared with a cytochrome C oxidase stain, type I fibers stain darker than type II fibers.  (See References)

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C) they normally stain darker than type II fibers on a cytochrome C oxidase stain of skeletal muscle

This answer is correct.


On a normal skeletal muscle biopsy prepared with a cytochrome C oxidase stain, type I fibers stain darker than type II fibers.  (See References)

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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 are lighter in color

This answer is incorrect.


Type I muscle fibers are redder in color, whereas type II muscle fibers are whiter in color.
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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