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Les

From Biology-Online Dictionary | Biology-Online Dictionary
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Les --> lower oesophageal sphincter

(Science: anatomy) a muscular sphincter located at the junction of the oesophagus and the stomach. On closure the lower oesophageal sphincter prevents the back wash (reflux) of stomach acid into the oesophagus where it may damage the mucosa.

See: gastrooesophageal reflux disease.