<prompt> Dopamine in dose concentration at 2mcgkgmin acts predominantly on?Beta-1D-1Alpha-1None  <response>: Ans. B. D-1At low doses 2mgkgminutestimulates dopaminergic receptors on renal blood vessels leading to vasodilation. DA infusion at this rate may increase renal blood flow and promote diuresis.At intermediate infusion rates 2-5mgkgmin, used in CHF, cardiogenic shockStimulates b1 receptors on heart increasing cardiac contractility. Also stimulates D1 receptorsAt higher infusion rates 5-15mgkgmin, used for shock with oliguriaActs on a1, leading to vasoconstriction and rise in BP. Also stimulates D1 b1 receptors 