An Inhaler Used to Treat Airway Constriction in Asthma or Allergy

Question

An inhaler used to treat airway constriction in asthma or allergy might contain a drug that
A) activates ?1 adrenergic receptors.
B) activates ?2 adrenergic receptors.
C) activates muscarinic cholinergic receptors.
D) blocks ?2 adrenergic receptors.
E) activates ?2 adrenergic receptors or activates muscarinic cholinergic receptors.

Accepted Answer

An inhaler used to treat airway constriction in asthma or allergy contains a drug that activates ?2 adrenergic receptors. This activation causes smooth muscle relaxation in the airways, leading to bronchodilation and relief of airway constriction. The other options either activate different receptors or block the ?2 adrenergic receptors, which would lead to opposite effects.