Sphincters of the oesophagus.
D000818:Animals; D002940:Circadian Rhythm; D004702:Endocrine Glands / Q000502:physiology; D004935:Esophageal Diseases / Q000503:physiopathology; D004943:Esophagogastric Junction / Q000033:anatomy & histology / Q000502:physiology* / Q000503:physiopathology; D006801:Humans; D008365:Manometry; D009126:Muscle Relaxation; D009129:Muscle Tonus; D009130:Muscle, Smooth / Q000502:physiology; D011312:Pressure