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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Bavosi, John |
Bildgröße: | 3543 px × 2853 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |