Parasympathetic Nervous SystemSalivationSubmandibular GlandCarbacholParotid GlandAtropineElectric StimulationSympathetic Nervous SystemSalivaElectric Stimulation TherapyCholinergic AgonistsStimulation, ChemicalDeep Brain StimulationPhysical StimulationReceptors, MuscarinicTranscranial Magnetic StimulationMuscarinic AgonistsCalciumCells, CulturedMuscle ContractionMuscle, SmoothTime FactorsGuinea PigsParasympathomimeticsSignal TransductionDose-Response Relationship, DrugRats, Sprague-DawleyTranscutaneous Electric Nerve StimulationCatsMuscarinic AntagonistsAction PotentialsIsoproterenolCell LineKineticsPhosphorylationEnzyme ActivationAcetylcholineReceptor, Muscarinic M3Cyclic AMPVagus NerveRats, WistarElectrodes, ImplantedPhotic StimulationNorepinephrineNeuronsEvoked PotentialsMembrane PotentialsAcoustic StimulationElectrophysiologyTracheaProtein Kinase CHistamineRabbitsSynaptic TransmissionRNA, MessengerRats, Inbred StrainsPhosphatidylinositolsEnzyme InhibitorsPotassiumLymphocyte ActivationEvoked Potentials, MotorQuinuclidinyl BenzilateDogsReceptor, Muscarinic M2Inositol PhosphatesColforsinNeural InhibitionMice, Inbred C57BLAfferent PathwaysAdrenergic beta-AgonistsParasympatholyticsReflexIleumPirenzepineElectromyography