FAST TWITCH MUSCLE FIBER
\fˈast twˈɪt͡ʃ mˈʌsə͡l fˈa͡ɪbə], \fˈast twˈɪtʃ mˈʌsəl fˈaɪbə], \f_ˈa_s_t t_w_ˈɪ_tʃ m_ˈʌ_s_əl f_ˈaɪ_b_ə]\
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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)
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Dopamine Acetyltransferase
- An enzyme that catalyzes the of groups from acetyl-CoA to arylamines. They have wide specificity for aromatic amines, particularly serotonin, and can also catalyze acetyl transfer between arylamines without CoA. EC 2.3.1.5.
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