Pathophysiology of Emphysema Development Steps:

• Inhalation of cigarette smoke (event 2) triggers chronic inflammation in the lungs.
• Inflammatory cells, like neutrophils and macrophages, are recruited and release proteolytic enzymes, such as elastase (event 3).
• Unchecked enzymes destroy alveolar walls and elastic fibers (event 1).
• This leads to permanent enlargement of airspaces and loss of lung elasticity (event 4). Why B is correct:
• B (2-3-1-4) aligns with the protease-antiprotease imbalance theory, where irritant exposure precedes enzyme release, tissue destruction, and airspace remodeling. Why the others are wrong:
• A (2-4-1-3): Sequences enlargement before destruction, reversing cause and effect.
• C (4-2-1-3): Begins with end-stage enlargement, ignoring initial irritant trigger.
• D (4-1-2-3): Starts with enlargement and destruction before exposure, defying pathogenesis.

Final answer: B