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Elsa Marie Elsa Marie
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11 years ago Edited: 8 years ago, bio_man
Question #17.  Most subjects use their dominant forearm far more than their nondominant forearm. What does this indicate about degree of activation of motor units, and these factors: muscle fiber diameter, maximum muscle fiber force, and time to muscle fatigue?

Skeletal Muscle Physiology: Frogs and Human
Source  Human Anatomy & physiology Lab manual 1 by Elaine Marieb and Susan Mitchell
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Valued Member
Educator
11 years ago
Generally, since people use their dominant forearm more, the muscle fibers in that arm are activated for more prolonged periods. Thus, increase in muscle fiber diameter (muscular hypertrophy) usually results, allowing for increased force. Increased activity generally leads to increased respiratory and contractual efficiency, resulting in a greater time to muscle fatigue.
Elsa M. Author
wrote...
11 years ago
Thank you Slight Smile
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