Muscle fibre anatomy. Illustration showing the structure of human muscles from the macroscopic (upper centre) to the microscopic (lower left) levels. At upper centre, a muscle is shown emerging from a thigh of a running human figure. The cutaway section shows the muscle consisting of muscle bundles (fascicles). Each fascicle consists of muscle fibres (the third stage shown here). The fibres consist of myofibrils, shown here with yellow sheaths, the cell membrane or sarcolemma. The smallest element are the myofilaments (lower left) consisting of the proteins actin and myosin. It is the movement of these proteins that causes muscle contraction. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Dalhoff, Henning |
Bildgröße: | 3830 px × 4724 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |