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These are the steps that happen in the digestive system:

ingestion (eating) → digestion (breaking down) → absorption →egestion (removal from the body)


Digested food molecules are absorbed in the small intestine. This means that they pass through the wall of the small intestine and into our bloodstream. Once there, the digested food molecules are carried around the body to where they are needed.

Only small, soluble substances can pass across the wall of the small intestine. Large insoluble substances cannot pass through. The slideshow shows how this


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