An inhaler used to treat airway constriction in asthma or allergy might contain a drug that
A) activates ß1 adrenergic receptors.
B) activates ß2 adrenergic receptors.
C) blocks muscarinic cholinergic receptors.
D) activates ß1 or ß2 adrenergic receptors
E) activates ß2 adrenergic receptors or blocks muscarinic cholinergic receptors.
Answer: E