Why there is sphincter muscles in the stomach?
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Sphincters are specialized muscles that are located at the upper esophagus (upper esophageal sphincter (UES)), gastroesophageal junction (lower esophageal sphincter (LES)), antroduodenal junction (pylorus), ileocecal junction (ICJ), and the anus (anal sphincter).
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a ring shape muscle that relaxes or tightens to open a passage or opening in the body
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