Metabolism is the total chemical reaction that sustains or maintains the life in a biological system, organism or cell. Metabolism can be two types on the basis of the products they made by forming or breaking of molecules. Catabolism is the process that includes the breaking of large macromolecules into smaller units by the chemical reaction and anabolism is the chemical reaction that involves the synthesizing the macromolecules by smaller units.
Metabolism is the process that involves or generates energy in these chemical reactions. Conversion of energy from food for cellular processes.
Exothermic reactions are catabolic, that is, they catalyze molecules, disintegrate them to be able to release energy to the environment that surrounds them and that is how they release or yield to the environment.
