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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.
1 In the absence of oxygen fermentation of the pyruvate molecule will occur. 2  When acteyl-CoA is produced, this molecule enters the citric acid cycle, which takes place in the mitochondrial matri x. 3  This molecule gets oxidized to CO2 and reduced NAD to NADH.