Muscle fibre anatomy. Illustration showing the structure of human muscles from the macroscopic (upper centre) to the microscopic (lower centre) levels
Muscle fibre anatomy. Illustration showing the structure of human muscles from the macroscopic (upper centre) to the microscopic (lower centre) levels. A skeletal muscle (pink) is shown attached to a bone. The muscle consists of muscle bundles (fascicles). Each fascicle consists of muscle fibres, which are shown here with nerves (yellow) enervating them and capillaries (red) supplying blood. The fibres consist of myofibrils, and the smallest element are the myofilaments within the myofibrils, consisting of the proteins actin and myosin. It is the movement of these overlapping protein strands that causes muscle contraction.
Size: 5000px × 3750px
Photo credit: © MAURIZIO DE ANGELIS/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No
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