What Is the Primary Function of the Transverse Tubules

Multiple Choice

What is the primary function of the transverse tubules?

A) Conduct action potentials from the surface of the muscle fiber to internal regions near myofibrils.
B) Act as a channel for Ca²⁺ ions during excitation-contraction coupling.
C) Form cross-bridges between actin and myosin during muscle contraction.
D) Attach troponin to tropomyosin.
E) Attach muscle fibers to skeletal elements to exert force.