title: Surface tension lowering substance in Eustachian tube function.
mesh_terms: D000818:Animals; D004285:Dogs; D005064:Eustachian Tube / Q000502:physiology*; D006801:Humans; D008433:Mathematics; D010033:Otitis Media / Q000503:physiopathology*; D011312:Pressure; D011663:Pulmonary Surfactants / Q000502:physiology; D013500:Surface Tension
chemical_list: D011663:Pulmonary Surfactants