Question

the skeletal muscles store calcium ions in the terminal cisternae of thesarcoplasm.sarcomere.sarcolemma.sarcosome.sarcoplasmic reticulum.

Explanation:

The terminal cisternae are specialized expanded regions of a muscle cell's internal membrane structure that stores calcium ions for muscle contraction. The sarcoplasm is the muscle cell cytoplasm, sarcomere is the contractile unit of muscle, sarcolemma is the muscle cell membrane, and sarcosome is a muscle mitochondria. Only the sarcoplasmic reticulum has terminal cisternae for calcium storage.

Answer:

sarcoplasmic reticulum.