<P> 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 all chemical reactions that occur in living organisms , including digestion and the transport of substances into and between different cells , in which case the set of reactions within the cells is called intermediary metabolism or intermediate metabolism . </P>
<P> 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 all chemical reactions that occur in living organisms , including digestion and the transport of substances into and between different cells , in which case the set of reactions within the cells is called intermediary metabolism or intermediate metabolism . </P>
our growth is done through what cell process
our growth is done through what cell process
Metabolism
Metabolism