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What is Muscle Fibers, Slow-Twitch?

    Skeletal muscle fibers having low myofibrillar ATPase activity, low glycogen content, and high myoglobin content, high mitochondrial oxidative enzyme activities, and an intermediate mitochondrial content which produce a slow twitch and are fatigue-resistant. (From Best, Physiological Basis of Medical Practice, 12th ed, p101)