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T tubules - traduction vers arabe
![A curly T pictured in the coat of arms of the former [[Teisko]] municipality, which was consolidated to [[Tampere]].](https://commons.wikimedia.org/wiki/Special:FilePath/Teisko.vaakuna.svg?width=200 "A curly T pictured in the coat of arms of the former [[Teisko]] municipality, which was consolidated to [[Tampere]].")
Wikipédia
T-tubules (transverse tubules) are extensions of the cell membrane that penetrate into the center 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 from the sarcoplasmic reticulum throughout the cell. T-tubule structure and function are affected beat-by-beat by cardiomyocyte contraction, as well as by diseases, potentially contributing to heart failure and arrhythmias. Although these structures were first seen in 1897, research into T-tubule biology is ongoing.
