Answer to Question #60370 in Human Anatomy and Physiology for Sanjukta Ghosh
2. The source of energy: aerobic (oxidation of fatty acids and carbohydrates) in a slow muscles and anaerobic (glycolysis) in fast ones. Glycolysis in fast fibers provides rapid flow of ATP because these fibers have high ATPase activity, rapid use and restocking of ATP.
3. Diameter of myofibrils. Red fibers (slow muscles) have a small diameter. White fibers have a much larger diameter and also contain a lot of glycogen molecules, but have fewer mitochondria.
4. The power of muscle contraction: small in slow muscles and significantly greater in fast muscles. Due to the formation of energy by glycolysis white fibers accumulate lactic acid that leads to muscle fatigue that is not characteristic of slow fibers.
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