Lower Esophageal Sphincter 1


Lower Esophageal Sphincter 1 : LES. Muscle fibers near the junction of the esophagus and the stomach. Designated to function as a one way valve. Normally the LES relaxes with swallowing to allow food to pass from the esophagus to the stomach, but stays tight the rest of the time to prevent the backflow of stomach contents into the esophagus
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