COPD Pathophysiology and Airflow Obstruction

Steps:

• Recall COPD involves chronic bronchitis (excess mucus) and emphysema (elasticity loss, alveolar damage).
• Match statement 1 to mucus hypersecretion narrowing airways.
• Match statement 2 to elastin degradation causing airway collapse.
• Match statement 3 to alveolar destruction reducing surface area and support.
• Note no statement 4 exists, eliminating options including it.

Why B is correct:

• COPD definition includes mucus (1), elasticity loss (2), and alveolar destruction (3) as key mechanisms obstructing airflow per GOLD guidelines.

Why the others are wrong:

• A includes nonexistent 4, ignoring only valid statements.
• C includes nonexistent 4, omitting elasticity loss.
• D excludes mucus hypersecretion, a core feature.

Final answer: B