TracheaTracheal NeoplasmsTracheal DiseasesTracheal StenosisGuinea PigsMuscle, SmoothNuclear Receptor Subfamily 2, Group C, Member 1Receptors, Thyroid HormoneBronchiMuscle RelaxationLarynxMuscle ContractionIntubation, IntratrachealRespiratory SystemMucusTracheotomyBronchoscopyLungHistamineEpitheliumAirway ObstructionNuclear Receptor Subfamily 2, Group C, Member 2TracheitisSRS-AExocrine GlandsMethacholine CompoundsBronchial DiseasesNeurokinin ATracheostomyBronchial NeoplasmsSubstance PParasympatholyticsParasympathetic Nervous SystemVagus NerveTracheoesophageal FistulaLaryngeal NervesAtropineLaryngeal CartilagesAcetylcholineMucous MembraneElectric StimulationTachykininsMucociliary ClearanceNuclear Receptor Subfamily 4, Group A, Member 1Fiber Optic TechnologyIsoproterenolAporphinesCapsaicinAirway ResistanceRespiratory MucosaCarbacholDogsThyroid CartilageLaryngoscopyIndomethacin