what is the valve that separates the stomach from the esophagus called? What is its function?

what is the valve that separates the stomach from the esophagus called? What is its function?
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The valve that separates the stomach from the esophagus is the cardia. It has the function of preventing acid gastric content from entering back into the esophagus. Insufficiency of this valve causes gastroesophageal reflux, a disease in which patients complain of bloating and heartburn (retrosternal burning). Digestion System - Image Diversity: stomach
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