Abiochemical process that liberates energy content of food for living organs

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The biochemical process that liberates energy content of food for living organs is called catabolism.

Catabolism is a process in which big molecules like those in the food we eat are broken down into small ones that can be used by the living organism to obtain energy. The energy that is liberated in this process is stored in molecules of adenosine triphosphate (ATP). These molecules are used by cells to produce energy in the process called cellular respiration, catalyzed by the enzyme ATPase. 

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