Terminal cisterns are enlarged areas of the sarcoplasmic reticulum (a form of smooth endoplasmic reticulum) in muscle cells that store calcium ions, which are essential for muscle contraction. They are not directly involved in storing acetylcholine, carrying action potentials, or linking the nervous system to the muscle cell in the way described by the other options.

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Terminal Cisterns _

Question 19

Multiple Choice

Terminal cisterns _.

A) store acetylcholine
B) carry the action potential deep into the muscle cell
C) are made of smooth endoplasmic reticulum
D) are an important link between the nervous system and the muscle cell

Correct Answer: