The body has levels of organization that build on each other. Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs. For instance, digestive system organs cooperate to process food.
"Different systems of the body has different functions. Your digestive system is responsible for taking in and processing food, while the respiratory system is working with the circulatory system is responsible for taking in oxygen and ridding carbon dioxide."
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