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Essentially, food is digested and broken down with acids and enzymes that the GI tract secrets. The nutrients from this broken down food are then absorbed into the blood stream for the bodies use. The food matter that the body does not want is then expelled as feces. That is it in a nutshell.

For a far greater explanation, I added a link below you can peruse.

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Q: What takes place in the GI tract?
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