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Type II Muscle Fiber

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Type IIB FibersEdit

Type IIb fast-twitch fibers, or fast glycolytic fibres (also known as Type IIx), are recruited for very short-duration high-intensity bursts of power such as maximal and near-maximal lifts and short sprints.[1] Type IIB fibres contain a low content of myoglobin, relatively few mitochondria, relatively few blood capillaries and large amounts glycogen. Type II B fibres are white, while Type I (slow twitch) fibers are red. Type IIB fibers are geared to generate ATP by anaerobic metabolic processes, however, they are not able to supply skeletal muscle fibres continuously with sufficient ATP, and fatigue easily

ATP at a fast rate and have a fast contraction velocity. Such fibres are found in large numbers in the muscles of the arms. [2]

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Muscle Factor X

External LinksEdit

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