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Q. No.Once the undigested and unabsorbed substances enter the caecum, their backflow is prevented by-
| 1. | Pyloric sphincter | 2. | Sphincter of Oddi |
| 3. | Ileo - caecal valve | 4. | Gastro-oesophageal sphincter |
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Subtopic: Â Introduction to Digestive System |Â Movement of Food in Gut |Â DIGESTION OF FOOD |
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