MUSCLE PHYSIOLOGY

Detailed explanation-1: -As mentioned earlier, the plasma membrane of a skeletal muscle fiber is called the sarcolemma. The sarcolemma invaginates into the cytoplasm of the muscle cell (sarcoplasm). This forms membranous tubules that pass across the muscle cells. These are called transverse tubules (or ‘T tubules’).

Detailed explanation-2: -The sarcolemma is also called the myolemma and is the cell membrane of a striated muscle fiber cell. The function of the sarcolemma is same as that of the plasma membrane of the eukaryotic cells. Thus, the correct answer is option (B), ‘Muscle fibres’.

Detailed explanation-3: -The sarcolemma maintains the intracellular milieu, actively transports substrates into the muscle cell, serves as a docking location for proteins originating in the basement membrane and cytoskeleton, and also transmits neural excitatory impulses that lead to muscle contraction.

Detailed explanation-4: -The plasma membrane of a skeletal muscle fiber is called the sarcolemma. The sarcolemma is the site of action potential conduction, which triggers muscle contraction. Within each muscle fiber are myofibrils-long cylindrical structures that lie parallel to the muscle fiber.

Detailed explanation-5: -● The plasma membrane of the muscle fibre is called sarcolemma. Sarcoplasm. ● The cytoplasm of the muscle fibre is called sarcoplasm.