Question

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in a skeletal muscle fiber, each myofibril is surrounded by a network of membranous channels that runs parallel to the myofibril and is called the

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Explanation:

In skeletal muscle fibers, the sarcoplasmic reticulum is a network of membranous channels that runs parallel to the myofibrils and stores and releases calcium ions important for muscle contraction.

Answer:

sarcoplasmic reticulum