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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.
CELLS USE A LOT OF ENERGY. Life is an energy intensive process. It takes energy to operate muscles, extract wastes, make new cells, heal wounds, even to think. Itâs in an organismâs cells where all this energy is spent. In some cells, as much as half of a cellâs energy output is used to transfer molecules across the cell membrane, a process called âactive transport.â. Cell movements require energy and thousands of energy-hungry chemical reactions go on in every living cell, every second, every day.