A muscle cell is also called muscle fiber . The plasma membrane is called Sarcolemma . The sarcolemma has multiple extensions to the cytoplasm in T tubules calls (transverse tubules). The cytoplasm is called Sarcoplasm and rough endoplasmic reticulum is called sarcoplasmic reticulum . Sarcolemma Binding of internalized (the T tubule) and sarcoplasmic reticulum, forming a three-chamber structure called Triad . The role of the triad is the rapid transmission of action potentials from the cell membrane of all fibers in the muscle.
The cytoplasm is filled with a cylindrical bundles of myofibrils.
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