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The overall mechanism of cellular respiration involves four subdivisions: glycolysis, in which glucose molecules are broken down to form pyruvic acid molecules; the Krebs cycle, in which pyruvic acid is further broken down and the energy in its molecule is used to form high-energy compounds such as NADH.

Source: Cellular Respiration - Cliffs Notes
It occurs after glucose has already been broken down within the mitochondrion, which is kind of like the main powerhouse of the cell where most of the metabolic process occurs. Please brainliest!