At 5 to 10 ?g/kg/min, dopamine:
A) activates beta-1 receptor sites, causing an increased heart rate and increased cardiac contractility.
B) activates dopaminergic receptor sites, causing renal and mesenteric artery vasodilation.
C) no longer activates dopaminergic receptor sites and predominately activates alpha-1 receptor sites.
D) has a negative chronotropic effect on the heart, but an increased inotropic effect.
Answer: A) activates beta-1 receptor sites, causing an increased heart rate and increased cardiac contractility.
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