The smooth endoplasmic reticulum found in muscle cells has a special name, the sarcoplasmic reticulum, and is responsible for storing and releasing which important ion? A) Ca²⁺ B) Mg²⁺ C) Na⁺ D) K⁺ E) Cl-

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The sarcoplasmic reticulum in muscle cells stores and releases calcium ions (Ca²⁺), which are crucial for muscle contraction.

The Smooth Endoplasmic Reticulum Found in Muscle Cells Has a Special