Bronchospasm is best described as constriction of bronchial smooth muscle.

• A. Rhonchi
• B. COPD
• C. Emphysema
• D. Bronchospasm

Answer: (D)

The main idea is airway narrowing caused by contraction of the bronchial smooth muscle. When the smooth muscle around the bronchi contracts, the airway radius decreases, which greatly increases airway resistance and makes breathing difficult. This dynamic constriction is what defines bronchospasm and explains symptoms like wheeze and dyspnea, especially in conditions such as asthma or allergic reactions.

Rhonchi are not the constriction itself; they’re auscultatory sounds produced by secretions in larger airways. COPD and emphysema are chronic diseases characterized by long-standing structural changes in the airways and lung tissue, not specifically acute smooth muscle constriction. So describing bronchospasm as constriction of bronchial smooth muscle best fits the concept.