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Cellular respiration is the 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.
1 Cellular respiration, the process in which nutrients are converted into useful energy in a cell. 2  Anaerobic respiration, cellular respiration without oxygen. 3  Maintenance respiration, the amount of cellular respiration required for an organism to maintain itself in a constant state. Cellular respiration, the process in which nutrients are converted into useful energy in a cell. 2  Anaerobic respiration, cellular respiration without oxygen. 3  Maintenance respiration, the amount of cellular respiration required for an organism to maintain itself in a constant state.