Calcium ions couple excitation of a skeletal muscle fiber to contraction of the fiber. Where are calcium ions stored within the fiber? in the transverse tubules. in the sarcoplasmic reticulum. in the nuclei. in the mitochondria.

Calcium ions couple excitation of a skeletal muscle fiber to contraction of the fiber. Where are calcium ions stored within the fiber?
in the transverse tubules.
in the sarcoplasmic reticulum.
in the nuclei.
in the mitochondria.

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