The overall mechanism of cellular respiration<span> 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: </span><span>Cellular Respiration - Cliffs Notes</span>
The starting molecule is ATP
Glycolysis is the first stage of cellular respiration that occurs in the cytoplasm of animal cells. It is the only stage that occurs outside of the mitochondrion.
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