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B
Is poorly developed
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C
Is irregularly shaped
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D
None of the above
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Solution
The correct option is A Is known as sarcoplasmic reticulum
sarcoplasmic reticulum is a specialized type of smooth ER that regulates the calcium ion concentration in the cytoplasm of striated muscle cells.
sarcoplasmic reticulum is a membrane-bound structure found within muscle is also known as endoplasmic reticulum of muscle. so option A is correct answer .