The ____ is a functional portion of the esophagus where the walls of the esophagus contract inwardly, forming a physical barrier to the reflux of stomach contents up the esophagus.

Question

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The lower esophageal sphincter is the functional portion of the esophagus that contracts inwardly, forming a barrier to prevent the reflux of stomach contents up the esophagus. The upper esophageal sphincter is located at the top of the esophagus and helps to prevent air from entering the esophagus during breathing. The upper and lower hypoepiglottic sphincters do not exist.

The ____ Is a Functional Portion of the Esophagus Where