The antireflux mechanism.
D004943:Esophagogastric Junction / Q000000981:diagnostic imaging / Q000502:physiology* / Q000503:physiopathology; D005764:Gastroesophageal Reflux / Q000000981:diagnostic imaging / Q000503:physiopathology; D006551:Hernia, Hiatal / Q000000981:diagnostic imaging; D006801:Humans; D008365:Manometry; D011859:Radiography