Myofilaments or myofibrils are

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(B) Myofilaments or myofibrils are parallely arranged filaments of muscle fibre.Each muscle fibre is lined by a plasma membrane called the sarcolemma,

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Parallely arranged filaments of muscle fibre

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(B) Myofilaments or myofibrils are parallely arranged filaments of muscle fibre.Each muscle fibre is lined by a plasma membrane called the sarcolemma,which encloses the sarcoplasm.$A$ muscle fibre is a syncytium because the sarcoplasm contains many nuclei.The endoplasmic reticulum,i.e.,the sarcoplasmic reticulum of the muscle fibres,is the storehouse of calcium ions.$A$ characteristic feature of the muscle fibre is the presence of a large number of parallely arranged filaments in the sarcoplasm,which are called myofilaments or myofibrils.

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