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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.
Fat cells have many mitochondria because they store a lot of energy. Muscle cells also have abundant mitochondria that allow them to respond quickly to the need of performing activities. ATP production via mitochondria is done by the process of respiration using oxygen in a process that generates energy.at cells have many mitochondria because they store a lot of energy. Muscle cells also have abundant mitochondria that allow them to respond quickly to the need of performing activities. ATP production via mitochondria is done by the process of respiration using oxygen in a process that generates energy.