T tubules is the term for the extensions of the muscle cell plasma membrane that extend into the interior of the cell to bring rapid delivery of the electrical stimulus to many sarcomeres at once.
Transverse tubules, also known as T-tubules, are protrusions of the cell membrane that enter the center of cardiac and skeletal muscle cells. T-tubules enable quick transmission of the action potential into the cell and are crucial in controlling cellular calcium levels due to their membranes' high densities of ion channels, transporters, and pumps.
By synchronizing the release of calcium from the sarcoplasmic reticulum across the cell, T-tubules enable cardiac muscle cells to contract more powerfully.
Cardiomyocyte contraction and illness may both have an impact on T-tubule shape and function, which may result in arrhythmias and heart failure. Despite the fact that T-tubule formations were originally seen in 1897, research into their biology is still continuing.
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