The sarcoplasmic reticulum is a network of internal membranes that stores and releases calcium ions for muscle contraction.
The sarcoplasmic reticulum is an internal network of membranes that stores and releases calcium ions essential for muscle contraction.
| Front | Sarcoplasmic reticulum |
|---|---|
| Back | Network of internal membranes store and releases calcium ions need for muscle contraction |
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