Which dosage of dopamine results in stimulation of beta1 receptors and increased myocardial contractility?

Question

Quizplus · Accepted Answer

At low dosages of 1 to 2 mcg/kg/min,dopamine stimulates dopaminergic receptors,causing renal and mesenteric vasodilation.Moderate dosages result in stimulation of beta1 receptors to increase myocardial contractility and improve cardiac output.At dosages greater than 10 mg/kg/min,dopamine predominantly stimulates alpha receptors,resulting in vasoconstriction that often negates both the beta-adrenergic and dopaminergic effects.

Which Dosage of Dopamine Results in Stimulation of Beta1 Receptors