In striated muscle cells, which of these structures stores calcium ions that trigger contraction?

Question

Quizplus · Accepted Answer

The terminal cisterns are specialized areas of the sarcoplasmic reticulum that store calcium ions. When an action potential travels down the T-tubules, it triggers the release of calcium ions from the terminal cisterns, which then bind to troponin on the myofibrils and initiate muscle contraction. The internal surface of the plasma membrane and the myofibrils themselves do not store calcium ions in striated muscle cells.

In Striated Muscle Cells, Which of These Structures Stores Calcium