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.
Correct Answer:
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B)
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