If enterokinase is absent in small intestine, which digestive enzyme remains inactive?
Correct answer: B. Trypsinogen
- A. Pepsinogen
- B. Trypsinogen
- C. Amylase
- D. Lipase
Explanation
Enterokinase from the duodenal lining converts inactive trypsinogen into trypsin, which then activates the other pancreatic proteases, so without it trypsinogen stays inactive. Pepsinogen is the tempting answer but it is activated by HCl in the stomach, not by enterokinase, and amylase and lipase are secreted already active.
This question appeared on the UHS MDCAT 2026 paper, which you can sit online with every answer explained.
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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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