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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.
As you know, oxygen is your most important nutrient. You can live weeks to months without food, days without water, but only minutes without air. With nutrients from your food, oxygen provides the energy for your immune system, growth, maintenance, repair, and all the other functions of your body.