Ace the 2026 Respiratory & Infectious Disease Nursing Exam – Your Path to Nursing Mastery!

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Which option is NOT a mechanism by which bronchodilators improve COPD symptoms?

They relax airway smooth muscle

They increase FEV1

They narrow the airways

Bronchodilators help COPD symptoms by relaxing airway smooth muscle, which widens the airways, lowers airway resistance, and improves airflow. This increase in caliber translates to a higher FEV1 and better ventilation, meaning gas exchange improves and dyspnea can lessen. They do not narrow the airways; in fact, narrowing would worsen airflow. So the statement that bronchodilators narrow the airways is not a mechanism by which they improve symptoms.

They improve ventilation

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