Small extensions of the muscle cell's plasma membrane that connect with myofibrils are called
A) T tubules.
B) cross-bridges.
C) sarcoplasmic reticulum.
D) neuromuscular junctions.
E) neurotransmitters.

Question

Quizplus · Accepted Answer

T tubules, or transverse tubules, are small extensions of the muscle cell's plasma membrane that penetrate into the cell and connect with myofibrils, facilitating the transmission of action potentials.

Small Extensions of the Muscle Cell's Plasma Membrane That Connect