<prompt> Which of the following sympathetic receptors acts as vasoconstriction and vasodilatation:Alpha 1 and Alpha 2Alpha 1 and Beta 1Alpha 1 and Beta 2Beta 1 and Beta 2  <response>: Ref: Katzung 14th ed. pg. 145-47Alpha 1 and Beta 2 receptors present at blood vessels causing vasoconstriction and vasodilatation respectively.Sympathetic receptors, their location, function and G protein.ReceptorLocationFunctionG-Proteina1BV, smooth muscle, Salivary glandsVasoconstriction Increase secretionGqa2Presynapse Beta pancreatic cellBrakeInhibit NA releaseDecrease insulin releaseGib1Heart JG cellInc Heart rate Renin releaseGsb2LungsSmooth muscle LiverBronchodilatation Relaxation of smooth muscles GlycogenolysisGsb3Adipocyte Detrusor muscleLipolysis, thermogenesis Bladder relaxGs 