Skeletal muscles develop force and cause movement. The parenchymal cells of the muscle tissue are multinucleated syncytia, the muscle fibres, which may be more than 10 cm long. Most muscles consist of one set of fibres, i.e. the fibres do not act in series. Each fibre contains serially arranged sarcomeres the length of which changes from 1.3 to 3.5 μm during shortening and stretching, demonstrating the variable length of the muscle fibre.
KeywordsSarcoplasmic Reticulum Motor Unit Thin Filament Sarcomere Length Myosin Head
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