Multiple Choice
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.
A) upper esophageal sphincter
B) lower esophageal sphincter
C) upper hypoepiglottic sphincter
D) lower hypoepiglottic sphincter
Correct Answer:
Verified
Correct Answer:
Verified
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