試題詳解

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