Glucose goes throught the process of glycolysis where 2 ATP and result in two pyruvate molecules, reduced electron carriers, and 4 ATP. In the absence of oxygen, pyruvate is fermented into ethanol or lactase. In the presence of oxygen, pyruvate is converted into acetyl-CoA, reduced electrons, and carbon dioxide, and the acetyl-CoA enters the citric acid cycle. In the citric acid cycle, acetyl-CoA is completely oxidized and reduced electrons, ATP, and carbon dioxide are produced. The reduced electrons are used in the electric transport chain, where they are passed down protiens in the mitochondrial inner membrane. The passing of electrons generates a proton gradient, where H+ is shuttled into the inner membrane space. The protons flow out of ATP synthase and produce ATP. The process is the same for the oxidation of fat besides for glycolysis and acetyl-CoA formation. Lipids are oxidized through beta-oxidation to produce acetyl-CoA, which then follows the same pathway as glucose.
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