Muscles consist of several muscle bundles. These muscle bundles are composed of several muscle fibres or myocytes. They are held together by a layer of connective tissue and are lined by sarcolemma. Each muscle fibre is composed of several parallely arranged strands called myofibrils. The myofibrils contain two important proteins: actin and myosin. The striated appearance of the muscle fibre is due to these proteins. Actin forms the light band and myosin forms the dark band.
Muscle Fibre
