_______________________a investigations of the sarcolemma penetrating deep into the interior of the muscle cells
A T-tubule is a deep invagination of the sarcolemma, which is the plasma membrane, only found in skeletal and cardiac muscle cells. These invaginations allow depolarization of the membrane to quickly penetrate to the interior of the cell. ... a role in remodelling of sarcolemma, sarcoplasmic reticulum, and myofibrils.