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1st: inferior esophageal sphincter (near esophagus passin through the diaphragm, prevents the reflux of gastric juices into the esophagus). 2nd: pyloric sphincter (at the pyloric part of stomach, controls the flow of contents from the stomach into the duodenum). 3rd: internal, external anal sphincter (lies in the anal canal and controls the discharge of wastes).

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16y ago

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