The Chief Function of the T-Tubules is To

Question

The chief function of the T-tubules is to:
A)provide nutrients to the muscle fiber.
B)allow for the fiber to contract.
C)allow for electrical signals to move deeper into the cell.
D)allow for the generation of new muscle fibers.

Accepted Answer

T-tubules are invaginations of the sarcolemma of muscle fibers, which allow for electrical signals (action potentials) to penetrate deeply into the interior of the cell, facilitating synchronous contraction of the entire fiber. This is important because it allows for a coordinated contraction of the muscle fiber. A and D are incorrect because T-tubules do not provide nutrients and they don't play a role in generating new muscle fibers, respectively. B is also incorrect because muscle fibers contract due to the sliding of the myofilaments, which is not directly affected by T-tubules.