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Skeletal muscle actin myosin filaments, SEM

Skeletal muscle actin myosin filaments, SEM

C036/9757

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Credit

DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY

Caption

Skeletal muscle fibre with exposed intracellular actin myosin filaments, scanning electron micrograph (SEM). The muscle fibre was cut perpendicular to its length to expose the intracellular actin myosin filaments. Skeletal muscle is one of three major types of muscle. It is considered striated muscle tissue (part of the somatic nervous system). Most skeletal muscles are attached to bones by bundles of collagen fibres (called tendons). Skeletal muscle has multiple bundles of cells called muscle fibres (or fascicles). The fibres and muscles are surrounded by connective tissue layers called fasciae. Muscle cells are formed from the fusion of developmental myoblasts (myogenesis). Muscle fibres are composed of myofibrils that are composed of actin and myosin filaments. Magnification: x220 when shortest axis printed at 25 millimetres.

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