Question
                When you vomit, the 
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has to open to allow the stomach contents to move up into the esophagus.
            
        [ Select ]
has to open to allow the stomach contents to move up into the esophagus.
Answers
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                    Answered by
            GPT-4o mini
            
    When you vomit, the **lower esophageal sphincter (LES)** has to open to allow the stomach contents to move up into the esophagus.
    
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