1 MCQs in Medicine for NEET PG
A 22-year-old male with cystic fibrosis presents for routine spirometry during a stable clinical state. His flow-volume loop is shown in the diagram. The structure marked **B** demonstrates a characteristic concave, scooped expiratory limb with reduced FEV1/FVC ratio of 0.62 and FEF25-75 of 28% predicted. Which of the following pathophysiological mechanisms BEST explains the morphology of curve **B**?
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