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The function (job) of the intestine is to digest and absorb food. Digestion means breaking down food into soluble substances which can be absorbed. For example, starch is broken down into sugar (glucose) and protein is broken down into amino acids. So, the substances which are taken in by the blood from the intestine are digested foods, for example sugar (glucose) and amino acids. Most food is absorbed by the small intestine. Undigested food and water pass into the large intestine which takes some of the water back into the blood. See http://www.kidshealth.org/kid/body/digest_SW.html http://www.bbc.co.uk/schools/ks3bitesize/science/Biology/diet_5.shtml

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