MUSCLE PHYSIOLOGY

Detailed explanation-1: -Each muscle fibre is lined by the plasma membrane called sarcolemma enclosing the sarcoplasm . Muscle fibre is a syncitium as the sarcoplasm contains many nuclei. The endoplasmic reticulum, i.e., sarcoplasmic reticulum of the muscle fibres is the store house of calcium ions.

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 is a specialized cell membrane which surrounds striated muscle fiber cells. Sometimes called the myolemma, the sarcolemma is similar to a typical plasma membrane but has specialized functions for the muscle cell.