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Valve which separates the stomach from the esophagus

What is the valve which separates the stomach from the esophagus termed? Also state its function?

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The valve which separates the stomach from esophagus is the cardia. It has the purpose of preventing acid gastric content from entering back into esophagus. Deficiency of this valve causes gastroesophageal reflux, a disease in which the patients complain of bloating and heartburn (or retrosternal burning).

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