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The primary reservoir for calcium that is released during excitation-contraction coupling in a skeletal muscle fiber is the

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The primary reservoir for calcium that is released during excitation-contraction coupling in a skeletal muscle fiber is sarcoplasmic reticulum.

What is the function of sarcoplasmic reticulum?

The sarcoplasmic reticulum is responsible for storeing calcium ions which it releases when a muscle cell is stimulated.

So we can conclude that the primary reservoir for calcium that is released during excitation-contraction coupling in a skeletal muscle fiber is sarcoplasmic reticulum.

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