Reverse flow of food in the stomach is prevented by

Uvula

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pyloric sphincter

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ileo caecal valve

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cardiac sphincter

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Solution

The correct option is D cardiac sphincter
The cardiac sphincter is a circular muscle located at the distal end of the oesophagus. It relaxes to allow the passage of ingested food into the stomach, and constricts so that contents of stomach do not move back to the oesophagus.

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