Answer:
The transverse tubules (T-tubules) of mammalian cardiac and skeletal muscles are invaginations of the sarcolemma. They play a crucial role in excitation-contraction coupling as well as in intracellular signaling and in regulation of glucose transport
Step-by-step explanation:
T-tubules allow the depolarization impulse to rapidly propagate through the interior of the muscle fiber. This ensures that calcium release from the sarcoplasmic reticulum occurs uniformly throughout the fiber allowing for synchronized contraction of myofibrils in each muscle cell.
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