Epinephrine

Question

Epinephrine
A)Dilates bronchioles through α1 receptors
B) Constricts bronchioles through α1 receptors
C) Dilates bronchioles through β2 receptors
D) Constricts bronchioles through β2 receptors
E) Dilates bronchioles through α2 receptors

Accepted Answer

Epinephrine dilates bronchioles primarily through its action on β2 adrenergic receptors, which are responsible for relaxing smooth muscle in the bronchioles and thus increasing airway diameter.