False-colour TEM of mammalian skeletal muscle

False-colour TEM of mammalian skeletal muscle


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False-colour transmission electron micrograph (TEM) of a section through mammalian skeletal muscle. The striated banding-pattern of the muscle fibrils can be seen. The fibrils run in parallel (left to right) & between them runs a sarcoplasmic reticulum (green, bubble-like) which transmits nerve impulses to the fibrils. Within each fibril are contractile units called sarcomeres (separated by the green lines). A sarcomere contains protein filaments of myosin (orange) & actin (blue) which slide over each other, thereby causing the whole muscle to contract. Skeletal muscle is responsible for voluntary movement of bones of the skeleton & of organs such as the eye.

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