Beta-2 adrenergic receptor

In medicine and physiology, beta-2 adrenergic receptors, or β-2 adrenergic receptors, are adrenergic receptors that are a "subclass of beta-adrenergic receptors (receptors, adrenergic,  beta). Beta-2 Adrenergic receptors are more sensitive to epinephrine than to norepinephrine and have a high affinity for the agonist terbutaline. They are widespread, with  clinically important roles in skeletal muscle, liver, and vascular,  bronchial, gastrointestinal, and genitourinary smooth muscle." Their functions include vasodilation.

Adrenergic beta-agonists, such as  terbutaline,  are used to treat asthma  by preventing bronchoconstriction.