Acid reflux into the esophagus ("heartburn")is normally prevented by __________.
A) pharyngeal constrictors
B) the upper esophageal sphincter
C) the lower esophageal sphincter (LES)
D) esophageal glands
E) pharyngeal and buccal sphincters

Question

Quizplus · Accepted Answer

The lower esophageal sphincter (LES) prevents acid reflux from the stomach into the esophagus by acting as a barrier between the two.

Acid Reflux into the Esophagus ("Heartburn")is Normally Prevented by __________