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Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products.
Metabolism in the absence of oxygen. Wasting or decrease in the size of a muscle or other tissue caused by lack of use. The efficiency with which the body delivers to cells the oxygen and nutrients needed for muscular activity and transports waste products from cells.