Which of the following statements about fast twitch muscle fibers is true?

A. The neuron innervating the muscle determines twitch characteristics.
B. Alpha motor neurons having large-diameter axons innervate fast twitch muscle fibers.
C. Using a long train of repetitive contractions identifies twitch characteristics.
D. Both A and B
E. A, B, and C


ANS: D
Rationale: The neuron innervating the muscle determines twitch characteristics and large-diameter axons innervate fast-twitch muscles.

Health & Biomechanics

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