Secretory RatePancreatic JuiceBicarbonatesMuscle ContractionPotassiumSodiumInsulinIsometric ContractionUterine ContractionMyocardial ContractionMuscle, SmoothElectric StimulationMuscle, SkeletalIsotonic ContractionVasoconstrictionCalciumGuinea PigsMuscle, Smooth, VascularMuscle RelaxationMuscle FatigueElectromyographyPotassium ChlorideGastrointestinal Motility