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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.
In the latter case, organic compounds most often provide energy (chemoorganotrophic metabolism). There are also bacteria that use reduced inorganic compounds as an energy source (chemoautotrophic metabolism). All three types of energy generation may occur both in the presence and in the absence of molecular oxygen.