Large Intestine: Water Reabsorption
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The large intestine reabsorbs water from undigested material, hosts microbial flora that aid digestion, and compacts the remainder into feces stored in the rectum.
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Too much water reabsorption produces constipation; too little produces diarrhea.
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The large intestine does little chemical digestion of its own — it mainly reabsorbs water and hosts microbial flora, not breaks down macromolecules.