Caption: An electron transport chain in aerobic respiration leads to formation of H2O during aerobic respiration in the citric acid cycle. The absence of oxygen halts process. During the citric acid cycle, high energy electrons are transferred to carrier molecules. These compounds are now reduced, allowing them to carry the high energy electrons to the next stage of cellular respiration, known as the electron transport chain. This so-called chain is actually a series of enzyme complexes that carry and pass along electrons. This process gradually lowers each electron's energy level, transferring that energy in a manner that leads to the formation of significant quantities of ATP. Neither glycolysis nor the citric acid cycle uses oxygen directly. Instead, the final enzyme of the electron transport chain gives up a pair of electrons that combine with two hydrogen ions and an atom of oxygen to form a water molecule.

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Keywords: adenosine triphosphate, aerobic respiration, atp, carrier molecules, citric acid cycle, electron transport chain, electrons, h20, krebs cycle, oxygen, water

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Aerobic respiration; Citric Acid Cycle

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