Artwork showing structure of human skeletal muscle

Artwork showing structure of human skeletal muscle

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Caption: Skeletal muscle. Illustration of the structure of human skeletal muscle. Skeletal muscle (top right) consists of bundles of long, thin cells called muscle fibres. A group of five muscle fibres with surrounding blood vessels is shown at centre. Each muscle fibre contains numerous "myofibrils", one of which is shown at lower centre. The myofibril is a bundle of two types of protein "myofilament": myosin (green) and actin (red). When the muscle is stimulated, tiny cross-bridges (lower left) in the myosin filaments hook onto actin filaments and pull them along. As a result, myosin and actin filaments slide over each other, shortening the muscle and making it contract.

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Keywords: actin, anatomy, artwork, human body, muscle, muscle fibre, muscles, myofibril, myosin, skeletal, skeletal muscle, striated muscle

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