What is the chief function of T tubules?
A) They allow electrical impulses to travel deep into the cell.
B) They store the calcium ions necessary for muscle contraction.
C) They contain myofilaments necessary for muscle contraction.
D) They store glycogen and oxygen.

Question

Quizplus · Accepted Answer

T tubules are invaginations of the plasma membrane that allow for the propagation of electrical impulses (action potentials) deep into the muscle cell. This is important for triggering the release of calcium ions from the sarcoplasmic reticulum, which then leads to muscle contraction. T tubules do not store calcium ions, myofilaments, glycogen, or oxygen.

What Is the Chief Function of T Tubules