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| Anaerobic Respiration Definition |
When a 6-carbon glucose molecule is decomposed in cellular respiration, enzymes control a series of reactions that break it into two 3-carbon pyruvic acid molecules. This phase of respiration (glycolysis) occurs in the cytoplasm, and because it takes place in the absence of oxygen, it is called anaerobic respiration.
Although some energy is needed to activate the reactions of anaerobic respiration, more energy is released than is used. A portion of the excess is transferred to molecules of an energy-carrying substance called ATP (adenosine triphosphate).
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