In a muscle fiber,Ca^{++} is stored in the .. | vedclass

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(A) In muscle fibers,the sarcoplasmic reticulum is a specialized type of smooth endoplasmic reticulum that regulates the calcium ion concentration in

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Sarcoplasmic reticulum

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(A) In muscle fibers,the sarcoplasmic reticulum is a specialized type of smooth endoplasmic reticulum that regulates the calcium ion concentration in the cytoplasm of striated muscle cells.It acts as a storage site for $Ca^{++}$ ions.When a muscle fiber is stimulated by an action potential,$Ca^{++}$ is released from the sarcoplasmic reticulum into the sarcoplasm,which triggers muscle contraction.Therefore,the correct option is $A$.

In a muscle fiber,$Ca^{++}$ is stored in the .....

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