<prompt> Precursor of adrenaline producing renal vasodilation is?DopamineAdrenalineNoradrenalineAcetylcholine  <response>: Ans: A Dopamine Ref:KDT, 6th ed,p. 126Dopamine: is a D1. D2, alpha beta 1 agonist.Low doses -D1 receptor in renal mesenteric blood vessels dilation - increase GFR, increase Na excretion.Moderate dosesBeta 1 receptor - inotropic action - increase cardiac contractility, no effect on heart rate.Large doses -Alpha 1 receptor - vasoconstriction - increase BP. 