SKELETAL MUSCLE, TEM
Striated muscle fiber in contraction. The name \striated muscle\ comes from the alternating of light-colored bands (shown here in pink) containing only thin filaments (actin) and dark-colored bands (shown here in fuschia) containing both thin filaments and thick ones (myosin). The movement of actin filaments against myosin filaments produces muscular contraction. On this image, the contraction of the muscle fibers is shown by the narrow light-colored bands on each side of the darker bands. The terminal of the motor neuron releases small vesicles (in yellow) containing a substance (acetylcholine) which, after connecting with receptors located in folds in the muscle plasma membrane (here in black), sets off the muscular contraction. In green, a mitochondrion. 24,000 x color-enhanced TEM image.
Size: 3630px × 2429px
Photo credit: © SERCOMI / BSIP / Alamy / Afripics
License: Licensed
Model Released: No
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