Zoe MCQ 12

Topic: Anatomy

Created on Saturday, November 26 2022 by zoe

Last modified on Saturday, November 26 2022.

 
        A) Red fibers (type I)
 
        B) Red fibers (type IIa and IIb)
 
        C) White fibers (type I)
 
        D) White fibers (types IIa and IIb)
 

 

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This question was created on November 26, 2022 by zoe.
This question was last modified on November 26, 2022.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS

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A) Red fibers (type I)

This answer is correct.

Red fibers (type I) are thin, contain abundant mitochondria, and contract weakly and slowly but are able to sustain contractions for long periods.  (See References)

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B) Red fibers (type IIa and IIb)

This answer is incorrect.

Red fibers is correct, but these are type I.   (See References)

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C) White fibers (type I)

This answer is incorrect.

Long distance relies more on red fibers. Additionally, White fibers are types IIa and IIb, used more for sprinting.  (See References)

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D) White fibers (types IIa and IIb)

This answer is incorrect.

White fibers (types IIa and IIb) are larger, contain relatively few mitochondria, and contract in briefer, more powerful twitches. Type IIb fibers use glycolysis almost exclusively to fuel their contractions and fatigue very rapidly. This would be used more for sprinting.  (See References)

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References:

1. Nolte Chapter 18: Pages 435

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anatomy
Zoe MCQ 12
Question ID: 112622084
Question written by zoe. (C) FrontalCortex.com 2006-2009, all rights reserved. Created: 11/26/2022
Modified: 11/26/2022
Estimated Permutations: 24