Context: Transverse tubules (T-tubules) are extensions of the cell membrane that penetrate into the centre of skeletal and cardiac muscle cells. With membranes that contain large concentrations of ion channels, transporters, and pumps, T-tubules permit rapid transmission of the action potential into the cell, and also play an important role in regulating cellular calcium concentration. Through these mechanisms, T-tubules allow heart muscle cells to contract more forcefully by synchronising calcium release throughout the cell. T-tubule structure may be affected by disease, potentially contributing to heart failure and arrhythmias. Although these structures were first seen in 1897, research into T-tubule biology is ongoing.\n\nQuestion: t or transverse tubules in skeletal muscle function to?
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permit rapid transmission of the action potential into the cell , and also play an important role in regulating cellular calcium concentration
The relevant information to answer the above question is: With membranes that contain large concentrations of ion channels, transporters, and pumps, T-tubules permit rapid transmission of the action potential into the cell, and also play an important role in regulating cellular calcium concentration.

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Thus, the answer is permit rapid transmission of the action potential into the cell , and also play an important role in regulating cellular calcium concentration