The sarcoplasmic reticulum of skeletal muscle A) sequesters Na⁺ ions B) possesses voltage-gated K⁺ channels C) is depolarized by T tubules D) is responsible for acetylcholine synthesis E) is responsible for synthesis of actin and myosin

Question

Quizplus · Accepted Answer

The sarcoplasmic reticulum of skeletal muscle is responsible for regulating the levels of calcium ions in the muscle fiber. It possesses calcium release channels that are activated by depolarization of the T tubules, which are invaginations of the plasma membrane that surround the myofibrils. Therefore, choice C is the correct answer as it correctly describes the depolarization of the T tubules. Choices A, B, D, and E are incorrect as they all describe functions or characteristics that are not associated with the sarcoplasmic reticulum of skeletal muscle.

The Sarcoplasmic Reticulum of Skeletal Muscle