Muscle Fibers, Fast-Twitch
MeSH ID: M0027953
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)
Terms:
- Muscle Fibers, Fast Twitch [T055534]
- Muscle Fibers, Type II [T055535]
Descriptors:
Semantic Types:
- Cell [T025]
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