Your skeletal muscle cells use calcium ions to stimulate muscle contraction.To prevent a constant state of contraction,these calcium ions are stored in between contractions and released into the cytoplasm for a contraction.The structures used for storing the calcium ions are
A) organelles derived from neighboring cells.
B) highly derived mitochondria that can also provide ATP.
C) extensions of the Golgi apparatus.
D) vesicles budded off from rough ER that do not fuse with the Golgi apparatus.
E) modifications of smooth ER within the muscle cells.

Question

Quizplus · Accepted Answer

Calcium ions are stored in modified smooth ER structures called sarcoplasmic reticulum (SR) within muscle cells. These structures release calcium ions into the cytoplasm during muscle contraction.

Your Skeletal Muscle Cells Use Calcium Ions to Stimulate Muscle