MeSH
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Muscle Fibers, Fast-Twitch

MeSH ID: D018656

DEFINITION: Skeletal muscle fibers having high myofibrillar ATPase activity, high glycolytic enzyme activities, and an intermediate glycogen content which produce a fast twitch. There are two types. Fast fatigable fibers, also called white fibers, have a low myoglobin content, and a small mitochondrial content, and fatigue rapidly due to their limited glycogen content and low capacity for oxidative metabolism. Fast fatigue-resistant fibers, also called red fibers, have a large mitochondrial content and a high myoglobin content, related to their resistance to fatigue. (From Best, Physiological Basis of Medical Practice, 12th ed, p100)

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Qualifiers:

chemistry [Q000737] ; classification [Q000145] ; cytology [Q000166] ; drug effects [Q000187] ; enzymology [Q000201] ; immunology [Q000276] ; metabolism [Q000378] ; microbiology [Q000382] ; parasitology [Q000469] ; pathology [Q000473] ; physiology [Q000502] ; radiation effects [Q000528] ; radiography [Q000530] ; radionuclide imaging [Q000531] ; secretion [Q000557] ; transplantation [Q000637] ; ultrasonography [Q000736] ; ultrastructure [Q000648] ; virology [Q000821]

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