Oculomotor MusclesMuscle, SmoothMusclesMuscle ContractionIleumMuscle ProteinsMuscle, SkeletalMyenteric PlexusMuscle Fibers, SkeletalMuscle, Smooth, VascularMuscle RelaxationMuscle DevelopmentGuinea PigsPeristalsisElectric StimulationAtropineMuscle FatigueMuscle Fibers, Fast-TwitchMuscle DenervationMuscle Fibers, Slow-TwitchColonMyocytes, Smooth MuscleGastrointestinal MotilityMitochondria, MuscleGastric FundusNeck MusclesEsophageal Sphincter, LowerAcetylcholineMuscle, StriatedEnteric Nervous SystemMuscle SpindlesTetrodotoxinRespiratory MusclesMuscle WeaknessPapillary MusclesEsophageal Sphincter, UpperGuanethidineAbdominal MusclesQuadriceps MuscleMuscle CellsNeuromuscular JunctionCarbacholMasseter MuscleEsophagusApaminFacial MusclesMasticatory MusclesIntercostal MusclesCalciumElectromyographyRats, WistarMuscular AtrophyMembrane PotentialsIsometric ContractionRabbitsDuodenumNitroarginineJejunumSatellite Cells, Skeletal MuscleReceptors, Serotonin, 5-HT4Motor NeuronsScopolamine HydrobromidePectoralis MusclesHistaminePhysostigmineMustard CompoundsParasympathetic Nervous SystemParasympathomimeticsVasoactive Intestinal PeptideMuscular DiseasesParasympatholyticsUterine ContractionStomachCharybdotoxinIntestine, SmallTime FactorsPsoas MusclesVas DeferensElectrophysiologyDose-Response Relationship, DrugMyofibrilsTemporal MuscleCholinergic FibersHindlimbPhentolamineDogsSerotoninBenzilatesHexamethonium CompoundsRats, Sprague-DawleyPotassium ChlorideAction PotentialsSerotonin 5-HT4 Receptor AntagonistsCells, CulturedPotassiumPyloric AntrumMyosin Heavy ChainsNorepinephrinePituitary Adenylate Cyclase-Activating PolypeptideOrganophosphate Poisoning