Edit Watch this page Read in another language Metabolism "Cell metabolism" redirects here. For the journal, see Cell Metabolism . For the architectural movement, see Metabolism (architecture) . Structure of adenosine triphosphate (ATP), a central intermediate in energy metabolism Metabolism (from Greek : μεταβολή metabolē , "change") is the set of life -sustaining chemical transformations within the cells of organisms . The three main purposes of metabolism are the conversion of food/fuel to energy to run cellular processes, the conversion of food/fuel to building blocks for proteins , lipids , nucleic acids , and some carbohydrates , and the elimination of nitrogenous wastes . These enzyme -catalyzed reactions allow organisms to grow and reproduce, maintain their structures, and respond to their environments. The word metabolism can also refer to the sum of ...
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