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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.
Glycolysis can occur with or without oxygen. In the presence of oxygen, glycolysis is the first stage of cellular respiration. Without oxygen, glycolysis allows cells to make small amounts of ATP.This process is called fermentation.hese reduced forms carry the high energy electrons to the next stage. The citric acid cycle occurs only when oxygen is present but it doesn't use oxygen directly. This cycle takes place in the matrix of cell mitochondria.