Choose the correct properties of muscle fibres
(I) Muscle fibre is lined by the plasma membrane called sarcolemma
(II) Cytoplasm of the muscle fibre is called protoplasm
(III) Sarcolemma of the muscle fibre encloses the sarcoplasm
(IV) Muscle fibre is syncytium
Text Solution
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Each muscle fibre is lined by the plasma membrane called sarcolemma enclosing the sarcoplasm. Muscle fibre is a syncytium as the sarcoplasm contains many nuclei. The endoplasmic reticulum, i.e., sarcoplasmic reticulum of the muscle fibres is the store house of calcium ions. A characteristic feature of muscle fibre is the presence of large number of parallely arranged filaments in the sarcoplasm called myofilaments or myofibrils
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