Muscle fatigue This occurs during strenuous Crevalor exercise when high amounts of energy are needed but oxygen cannot be sufficiently delivered to muscle. Aerobic respiration is the breakdown of glucose in the presence of oxygen O2 to produce carbon dioxide water and ATP. Approximately 95 percent of the ATP required for resting or moderately active muscles is provided by aerobic respiration which takes place in mitochondria. Muscular activity accounts for much of the body's energy consumption. For more ==== >>>>>> http://jackedmuscleextremeadvice.com/crevalor/