<P> 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 . </P>
<P> 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 . </P>
t or transverse tubules in skeletal muscle function to
t or transverse tubules in skeletal muscle function to
permit rapid transmission of the action potential into the cell , and also play an important role in regulating cellular calcium concentration
permit rapid transmission of the action potential into the cell , and also play an important role in regulating cellular calcium concentration