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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.
Cells cannot perform their functions. Cells need two things to function: fuel and oxygen. These allow all the cells in your body to produce energy to do any work that you want to do, like digesting or thinking. Without oxygen, your cells cannot undergo cellular respiration. It will fall back on anaerobic respiration, which produces less energy and has a by-product of lactate (Iactic acid). Failing that, your cells will begin to shut down.