Since each myofibril is attached at either end of the muscle fiber, when sarcomeres shorten, the muscle fiber

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When sarcomeres shorten, the overall muscle fiber shortens as well. This is due to the fact that the myofibrils, which make up the muscle fiber, are all attached at either end of the fiber. As the sarcomeres within the myofibrils shorten, the overall length of the myofibril and thus the muscle fiber is reduced.

Since Each Myofibril Is Attached at Either End of the Muscle