The part of digestive system which is NOT directly involved in digestion is:
Correct answer: B. Oesophagus
- A. Mouth
- B. Oesophagus
- C. Stomach
- D. Small intestine
Explanation
The oesophagus only carries the bolus from pharynx to stomach by peristalsis and secretes mucus for lubrication, with no digestive enzymes. The mouth starts starch digestion with salivary amylase, the stomach digests protein with pepsin, and the small intestine completes the digestion of all three food classes.
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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