In certain kinds of muscle cells,calcium ions are stored in ________.

Name: In certain kinds of muscle cells,calcium ions are stored in ________.
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Calcium ions are stored in the smooth endoplasmic reticulum (ER) in muscle cells. This storage is an important mechanism for regulating muscle contraction. When the muscle cell is stimulated, the calcium ions are released from the smooth ER into the cytoplasm, where they bind to proteins that initiate muscle contraction.

In Certain Kinds of Muscle Cells,calcium Ions Are Stored in ________