Dynamic contraction of muscles _____________________.
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is caused by the shortening of extrafusal muscle fibers; |
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is caused by the shortening of intrafusal muscle fibers; |
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may cause either flexion or extension; |
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both alternatives a and c are correct; |
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both alternatives b and c are correct; |
INCORRECT - Intrafusal muscle fibers are involved in maintaining muscle tone, not in causing dynamic contraction.
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