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the breakdown of food into molecules small enough to enter the bloodstream is primarily accomplished by the

User Alxndr
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it would be the digestive system

User Franklin Diaz
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The mouth, which breaks down large food particles into much smaller pieces for further digestion. But if you meant the last step before the food can be absorbed, it would be the duodenum, the first part of the small intestine.
User Bizi
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