<prompt> Dopamine at 1-2 Microgram Kg min produces-Renal vasodilatationPositive ionotropic effectMesenteric vasoconstrictionGeneralised vasoconstriction  <response>: Ans. is a i.e.. Renal vasodilatation o Dopamine produces dose dependent action: At low dose 1-2 mgkgmin causes dilation of renal and mesentric vessels - often referred as renal dose:At moderately high dose 2-10 pmkgmin produces a positive ionotropic effect by stimulating b1 receptor on heart - cardiac dose.At high doses 10 pmkgmin produces vasoconstriction by stimulating a, receptors - vascular dose. 