What specific muscle acts as a valve between the esophagus and stomach that may relax inappropriately due to acidic drinks like kaffir lime juice?
Answer
Lower esophageal sphincter (LES)
Heartburn and acid reflux symptoms associated with consuming highly acidic beverages like kaffir lime juice are often triggered by the inappropriate relaxation of the lower esophageal sphincter (LES). The LES is a muscular valve situated at the junction where the esophagus meets the stomach, intended to prevent stomach contents from flowing backward. Highly acidic foods and drinks can act as triggers that cause this sphincter to relax when it should remain tightly closed, allowing stomach acid to reflux upward into the esophagus. This backward flow of acid into the sensitive esophageal lining results in the characteristic burning sensation known as heartburn, especially in susceptible individuals.
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