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Separation of stomach from oesophagus

Which valve separates stomach from the oesophagus? Specify its function?

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Valve which makes the stomach seperatefrom the oesophagus is “cardia”. It prevents acid gastric content from entering back into the oesophagus. Deficiency of this valve may cause gastroesophageal reflux, disease in which the patients complains of bloating and heartburn i.e. retrosternal burning.

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