Gastrointestinal Anatomy | And Physiology: The Es...

Occurs when the LES weakens, allowing acid to damage the esophageal lining.

The esophagus is guarded at both ends by physiological valves known as sphincters: Gastrointestinal Anatomy and Physiology: The Es...

A layer containing connective tissue, blood vessels, and mucous-secreting glands that provide lubrication. Occurs when the LES weakens, allowing acid to

Triggered by the act of swallowing, this wave of contraction pushes the food bolus downward. Occurs when the LES weakens