Which of the following statements is not correct?
Action potentials travel into the interior of the muscle fiber by T tubules
Transverse tubules (T-tubules) are extensions of the sarcolemma (muscle cell membrane) that penetrate into the centre of skeletal and cardiac muscle cells.
The tiny gap between the innervating neuron and the sarcolemma of the muscle fibre it is innervating is called the synaptic cleft.