in the renal vascular bed where the predominant alpha-adrenoceptor corresponds to the alpha 1-subtype and there are few postsynaptic alpha 2-receptors subserving vasoconstriction , da can stimulate alpha 1-receptors but this action requires higher doses of agonist than those needed for alpha 2-adrenoceptor stimulation .
C0034784
alpha-adrenoceptor
C0001639
alpha 2-adrenoceptor