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A: Cells use energy in order to grow, regulate metabolism and reproduce. This energy is obtained from a source such as food molecules or light from the sun, and through processes like glycolysis, the citric acid cycle and oxidative phosphorylation, an energy-rich molecule is then created.
The bodyâs cells use a special form of energy called adenosine triphosphate (ATP) to power almost all their activities, such as muscle contraction, protein construction, transportation of substrates, communication with other cells, activating heat control mechanisms, and dismantling damaged and unused structures.