Muscle fibres, SEM

Muscle fibres, SEM

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Caption: Skeletal muscle. Coloured scanning electron micrograph (SEM) of skeletal (striated) muscle. The muscle fibres are extremely long, cylindrical cells. One of the fibres has been cut open to expose thin threads called myofibrils. Myofibrils are formed of alternating bands of the proteins actin and myosin, which give the fibres a striped appearance. The proteins slide over each other to allow the muscle to contract. Connective tissue (yellow) forms a sheath known as the endomysium, which holds the muscle fibres together. Skeletal muscle attaches to the skeleton and is controlled by the voluntary nervous system. Magnification: x670 when printed 10 centimetres wide.

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Keywords: anatomical, anatomy, biological, biology, cells, coloured, connective tissue, contractile organ, false-colour, false-coloured, fibres, frayed, human body, muscle, muscle fibre, muscles, muscular, musculature, myofibrils, physiological, physiology, scanning electron micrograph, scanning electron microscope, sem, skeletal, striated muscle, striped, torn, voluntary

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