This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
Which of the following sympathetic receptors acts as vasoconstriction and vasodilatation: 
Select and explain. 
A. Alpha 1 and Alpha 2, B. Alpha 1 and Beta 1, C. Alpha 1 and Beta 2, D. Beta 1 and Beta 2
C: Alpha 1 and Beta 2
Answer: C: Alpha 1 and Beta 2 
Explanation: (Ref: Katzung 14th ed. pg. 145-47)Alpha 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 cellBrake/Inhibit NA releaseDecrease insulin releaseGib1Heart JG cellInc Heart rate Renin releaseGsb2LungsSmooth muscle LiverBronchodilatation Relaxation of smooth muscles GlycogenolysisGsb3Adipocyte Detrusor muscleLipolysis, thermogenesis Bladder relaxGs