Bronchoconstrictor AgentsBronchoconstrictionAirway ResistanceBronchiBronchial Provocation TestsMethacholine ChlorideHistamineMethacholine CompoundsGuinea PigsIpratropiumVagotomyNeurokinin AProstaglandins DBronchial HyperreactivityAsthmaAdministration, InhalationBenzeneacetamidesCromolyn SodiumAerosolsHydantoinsForced Expiratory VolumeNedocromilBronchodilator AgentsAlbuterolLungReceptors, Neurokinin-2Vagus NerveThromboxane A2Dose-Response Relationship, DrugTerbutalineTachykininsSRS-ARespiratory Function TestsMuscle, SmoothNeprilysinIndomethacinTracheaCapsaicinAtropineSubstance PRespiratory SystemPropranololProstaglandin D2Double-Blind MethodAllergensOvalbuminSerotoninAcetylcholineMuscle ContractionTime Factors