Coloured TEM of a section through striated muscle

Coloured TEM of a section through striated muscle

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Striated muscle. Coloured transmission electron micrograph (TEM) of a longitudinal section through striated skeletal muscle. The striated banding- pattern of the muscle fibrils is seen. The fibrils run in parallel (from left to right) and between them runs sarcoplasmic reticulum that transmits nerve impulses to the fibrils. At top is a cell nucleus (purple). Within each fibril are contractile units called sarcomeres, separated by black lines. A sarcomere has protein filaments of myosin (red) and actin (green) that slide over each other, thereby causing the whole muscle to contract. Skeletal muscle is responsible for voluntary muscle movement in the body.

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Keywords: actin filament, anatomy, human body, muscle, muscles, myosin filament, sarcomere, skeletal muscle, striated muscle, striated skeletal

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