Ключевые слова: achalasia, acid, anatomy, animal, body, diaphragm, digestive, disease, drawing, endotracheal, engraving, esophageal, esophagus, expansion, fundus, gastric, gastroenterology, gastroesophageal, heartburn, hernia, herniation, illness, illustration, indigestion, intervention, junction, larynx, medical, organ, paraesophageal, pylorus, reflux, rings, science, sliding, sphincter, stomach, swallowing, system, throat, trachea, tracheal, tube, type, valve,