Binding of norepinephrine (NE)to an alpha-adrenergic receptor is usually excitatory,and binding to a beta-adrenergic receptor is usually inhibitory.

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Binding of norepinephrine (NE) to an alpha-adrenergic receptor typically leads to excitatory effects, such as vasoconstriction and increased blood pressure. Binding to a beta-adrenergic receptor usually leads to inhibitory effects, such as relaxation of smooth muscle and increased cardiac output.

Binding of Norepinephrine (NE)to an Alpha-Adrenergic Receptor Is Usually Excitatory,and