Muscle fibers contractions differ with regard to tension and shortening. When a muscle Fiber begins to contract (and the muscle fiber has yet to shorten), the contraction is called, ;when the muscle fiber is both contracting and shortening, the contraction 28. is called, A. Isometric : Isoconcentric B. Isotonic : Isoconcentric C. Isometric : Isotonic D. Isotonic : Isometric

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