The use of beta 2 antagonist drugs may be useful in asthma because
A)they may increase constriction of the skeletal muscle of the chest wall.
B)they may increase heart rate and therefore allow the patient to get more oxygen circulated.
C)they may dilate the bronchioles by relaxing their smooth muscle.
D)they may override the beta blockers that the patient is already taking.
E)they may obstruct all G protein-mediated receptors.

Question

Quizplus · Accepted Answer

Beta 2 antagonist drugs, also known as beta 2 agonists, work by binding to and activating beta 2 adrenergic receptors in the smooth muscle of the bronchioles, causing them to relax and dilate. This helps to relieve airway constriction and improve breathing in asthmatic patients. Option A is incorrect, as beta 2 agonists do not increase constriction of the skeletal muscle of the chest wall. Option B is incorrect, as while beta 2 agonists can increase heart rate as a side effect, this is not their primary mechanism of action in asthma. Option D is incorrect, as beta 2 antagonists are a class of drugs that work in opposition to beta blockers, and would not be used together. Option E is also incorrect, as beta 2 agonists are specific to beta 2 adrenergic receptors and do not obstruct other G protein-mediated receptors.

The Use of Beta 2 Antagonist Drugs May Be Useful