There is a very large number of metabolic pathways. In humans, the most important metabolic pathways are:
1) glycolysis, which is glucose oxidation in order to obtain Adenosine triphosphate (ATP); 2) citric acid cycle (Krebs' cycle), which is acetyl-CoA oxidation in order to obtain GTP and valuable intermediates; 3) oxidative phosphorylation, which is the disposal of the electrons released by glycolysis and citric acid cycle; 4) pentose phosphate pathway, which is the synthesis of pentoses and release of the reducing power needed for anabolic reactions; 5) urea cycle, which is the disposal of NH4+ in less toxic forms; 6) fatty acid b-oxidation, which is the breakdown of fatty acids into acetyl-CoA, to be used by the Krebs' cycle; 7) gluconeogenesis, which is glucose synthesis from smaller percursors, to be used by the brain.
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