The main function of the large intestine is
- A. the digestion of protein
- B. the absorption of water and mineral salts
- C. the secretion of bile
- D. the absorption of amino acids
Explanation
Undigested material entering the colon is very fluid, and the reabsorption of water and salts turns it into semi solid faeces, which is why disease that speeds transit causes diarrhoea and dehydration. Bacteria living there also synthesise vitamin K and some B vitamins. No digestive enzymes are secreted by the colon, so nutrient absorption is finished before this point.
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