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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.
Oxygen is the spark of life. Just as a fire canât burn without oxygen our cells canât produce heat and energy without oxygen. Oxygen is extracted from the air we breathe by the lungs. It passes into the blood vessels that surround the lungs and is carried to all the cells of the body by the blood.ust as a fire canât burn without oxygen our cells canât produce heat and energy without oxygen. Oxygen is extracted from the air we breathe by the lungs. It passes into the blood vessels that surround the lungs and is carried to all the cells of the body by the blood.