Calcium ions couple excitation of skeletal muscle fiber to contraction of the fiber. Where are calcium ions stored within the fiber?
A. Calcium ions are stored in the sarcoplasmic reticulum.
B. Calcium ions are stored in the transverse tubules.
C. Calcium ions are stored in the mitochondria.
D. Calcium ions are stored in the nuclei.
Ans: A. Calcium ions are stored in the sarcoplasmic reticulum.
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