The acidic chyme entering the duodenum is neutralised by
Correct answer: B. bicarbonate present in the pancreatic juice and bile
- A. hydrochloric acid
- B. bicarbonate present in the pancreatic juice and bile
- C. pepsin
- D. salivary amylase
Explanation
Pancreatic bicarbonate raises the pH to around 8, the alkaline range in which pancreatic and intestinal enzymes work. Acid from the stomach would inactivate them, so neutralisation is essential.
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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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