STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Skeletal muscle. Coloured transmission electron micrograph (TEM) of a section through skeletal (striated) muscle (pink). There is also a band of connective tissue (yellow). The muscle myofibrils, running from top to bottom, are split into contra- ctile units called sarcomeres by the discontinuous Z lines (black). A sarcomere contains protein filaments which can slide over each other to allow the muscle to contract. In the connective tissue are nerve fibres (light green) surrounded by the myelin sheaths (dark green) of Schwann cells. Granulated nuclei (pink) are also visible. Running from top centre to centre is part of a blood vessel. Magnification: x1,300 at 5x7cm size.
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