TracheaGuinea PigsMuscle, SmoothMuscle ContractionMuscle, Smooth, VascularMyocytes, Smooth MuscleMuscle RelaxationCarbacholMethacholine CompoundsMusclesHistamineCalciumAcetylcholineDogsMuscle TonusIsometric ContractionCells, CulturedCattleParasympatholyticsMuscle ProteinsEscinMethacholine ChlorideMyosin Light ChainsPotassium ChlorideIsoproterenolReceptors, MuscarinicAporphinesDose-Response Relationship, DrugMuscle, SkeletalElectric StimulationBronchoconstrictionAtropineSwineMyosin-Light-Chain KinaseHistamine AntagonistsMyosinsMuscle Fibers, SkeletalBradykininReceptors, BradykininAchilleaMuscle DevelopmentRabbitsViper VenomsDiaminesPhosphorylationCholinergic AgonistsPyrilamineInositol PhosphatesAorta