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Allows passage of food, fluids, and air. Esophagus. Flat muscular tube from laryngopharynx to stomach. Homeostatic Imbalance. Heartburn. Stomach acid regurgitates into esophagus. Likely with excess food/drink, extreme obesity, pregnancy, running. Also with . hiatal hernia - structural abnormality. Part of stomach above diaphragm ................
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