Muscle Fibers Fast-Twitch

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Muscle Fibers Fast-Twitch 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. (MeSH)

Muscle Fibers Fast-Twitch Synonyms

Muscle Fibers, Fast-Twitch, Muscle Fibers, Type II, Skeletal muscle fiber, type II

Terms in Muscle Fibers Fast-Twitch category

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