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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.
A: Respiration is important because it produces energy that is essential for the normal functioning of the body. Respiration provides cells with oxygen and expels toxic carbon dioxide. The BBC notes that cells need energy for movement, multiplication, the synthesis of essential molecules and maintaining body temperature.