3.7b Aerobic Respiration

When oxygen is available to a cell, pyruvate that was produced by glycolysis is oxidized to release more energy. In eukaryotic cells, this occurs in the mitochondria. The energy released to used to make ATP. Organisms used carbon dioxide as a waste product that is released.
Oxidation and reduction are chemical processes that occur together since it involves the loss and gain of electrons between each other. In oxidation, electrons are lost, while reduction is the gain of electrons.
Electron carries are substances that can accept and give up electrons when needed, linking oxidations and reductions in cells.
Oxidation and reduction can occur through the loss or gain of atoms of oxygen. Adding oxygen atoms to a molecule or ion is oxidation, while loosing oxygen atoms is reduction.
In the Krebs Cycle two molecules of pyruvate are produced in glycolysis per molecule of glucose. Contradicting glycolysis, this is not a single-step process. The oxidization  of pyruvate is gained by removing pairs of hydrogen atoms. Decarboxylations is the reaction where carbon & hydrogen are removed.

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