The main function of the large intestine is
Correct answer: B. the absorption of water and mineral salts
- 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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About Human Digestive System
The human digestive system breaks food into absorbable molecules through mechanical processing, enzyme action and chemical conditions along the alimentary canal. Questions cover the mouth, stomach, small and large intestines, liver, pancreas and associated secretions, including the digestion and absorption of carbohydrates, proteins, lipids, vitamins, minerals and water.
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