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What is metabolism? Metabolism can be defined as the set of physical and chemical changes that occur inside the human body that provide adequate energy for life processes and the synthesis of new materials. Metabolism allows the body to grow and function.
Metabolism is chemical reactions taking place inside cells, including respiration. The body excretes three main waste materials. These are Carbon Dioxide, Urea and Water. Excretion is a very important feature to us because without it toxic substances will build up in our bodies and kill us.It also helps in maintaining the composition of body fluids.hese are Carbon Dioxide, Urea and Water. Excretion is a very important feature to us because without it toxic substances will build up in our bodies and kill us. It also helps in maintaining the composition of body fluids.