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What is the lower esophageal sphincter (LES)?

Related Topics: Esophagus, Sphincter

Answers From Experts & Organizations (1)

7,995 Answers
373,785 Helpful Votes
The lower esophageal sphincter (LES) is the natural valve that keeps stomach contents in the stomach and out of the esophagus. When working properly, this important muscle operates like a door, letting food into the stomach but not back up into the esophagus. It is also known as LES.

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Archived: March 20, 2014

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