by 
Mike
ANSWERS: 5
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Protein, I believe.
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i am still wondering where this energy stuff came from but i love it
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Muscles obtain their energy via the citric acid cycle (krebs cycle). http://en.wikipedia.org/wiki/Krebs_cycle
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Metabolism produces high energy ATP from ADP Muscles use the energy in the ATP producing ADP again.
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Mitochondria are highly concentrated in muscle cells. They are the 'power plants' for the cell, producing ATP via oxidative pathways (aerobic cellular respiration). Creatine phosphte is an intermediary molecule that is also stored within the muscle cell to make ATP short-term while the mitochondria step up production. ATP molecules have high energy bonds used to power the contractile proteins of the muscle fibrils. The citric acid cycle (Krebs cycle) can provide backup energy via anaerobic pathways when respiratory pathways are exhausted.
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