Normally, the lower esophage...: Image

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Normally, the lower esophageal sphincter keeps the stomach contents contained with the stomach (top). However, with gastroesophageal reflux disease, the sphincter opens, allowing the acidic contents to flow up the esophagus. (Illustration by GGS I...
This image found in these articles:
  1. Gastroesophageal Reflux Disease
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