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)

Related Concepts:

• Muscle Fibers, Fast-Twitch [M0027953]
  Concept Semantic Types:
  • Cell [T025]
  Concept Terms:
  • Muscle Fibers, Fast Twitch [T055534]
  • Muscle Fibers, Type II [T055535]
• Muscle Fibers, White [M0027955]
  Concept Semantic Types:
  • Cell [T025]
  Concept Terms:
  • White Muscle Fibers [T055537]
• Muscle Fibers, Red [M0027954]
  Concept Semantic Types:
  • Cell [T025]
  Concept Terms:
  • Red Muscle Fibers [T055536]

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]

Tree Structure:

• Anatomy [A ]
  • Musculoskeletal System [A02 , D009141]
    • Muscles [A02.633 , D009132]
      • Muscle Fibers [A02.633.565 , D018485]
        • Muscle Fibers, Fast-Twitch [A02.633.565.600, D018656]

• Anatomy [A ]
  • Cells [A11 , D002477]
    • Muscle Cells [A11.620 , D032342]
      • Muscle Fibers [A11.620.249 , D018485]
        • Muscle Fibers, Fast-Twitch [A11.620.249.400, D018656]

Portions of this site are from MeSH 2007 which is created, maintained and provided by the U.S. National Library of Medicine.

Neither the United States Government or Slicksurface LLC, nor any of their agencies, contractors, subcontractors or employees make any warranties, express or implied, with respect to data shown on these pages, and, furthermore assume no legal liability for any party's use, or the result of such use.