The sarcoplasmic reticulum is (the)

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The sarcoplasmic reticulum is a specialized type of endoplasmic reticulum found in skeletal muscle fibers. It is responsible for storing and releasing calcium ions during muscle contraction. A is incorrect because the plasmalemma is the same as the cell membrane, which is separate from the sarcoplasmic reticulum. B is incorrect because the cytoplasm is the general term for the contents of a cell, which includes the sarcoplasmic reticulum but also many other components. D is incorrect because the plasmalemma and sarcoplasmic reticulum are separate structures, not extensions of each other. E is incorrect because C is the correct answer.

The Sarcoplasmic Reticulum Is (The)