The function of transverse tubules is to
A) store Ca²⁺ ions inside the muscle fiber.
B) rapidly conduct action potentials to the interior of the muscle fiber.
C) ensure a supply of glycogen throughout the muscle sarcoplasm.
D) conduct ATP molecules out of the mitochondria throughout the sarcoplasm.

Question

Quizplus · Accepted Answer

The function of transverse tubules, also known as T-tubules, is to rapidly conduct action potentials (electrical impulses) from the surface of the muscle fiber to the interior of the fiber. This allows for synchronous contraction of all the sarcomeres in the muscle fiber. Transverse tubules do not store Ca²⁺ ions, ensure a supply of glycogen, or conduct ATP molecules.

The Function of Transverse Tubules Is to