Your esophagus is a flattened muscular tube that connects your ... American Society of Gastrointestinal Endoscopy. Quick anatomy lesson: Human digestive system. National Institute of Diabetes and ...
The esophageal sphincter is a muscle at the bottom of your esophagus that acts like a one-way door. It opens to let food pass into your stomach and then closes tightly to keep it there. When this ...
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