<prompt> Dopamine at 1-2 Microgram Kg min produces?Renal vasodilatationPositive ionotropic effectMesenteric vasoconstrictionGeneralised vasoconstriction  <response>: Ans. is a i.e., Renal vasodilatation Dopamine produces dose dependent action: At low dose 1-2 ugkgmin causes dilation of renal and mesentric vessels - often referred as renal dose. At moderately high dose 2-10 ugkgmin produces a positive ionotropic effect by stimulating b1 receptor on hea - cardiac dose. At high doses 10 ugkgmin produces vasoconstriction by stimulating a1 receptors - vascular dose. 