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GCSE A Levels Biology MCQs App Download & e-Book PDF - 32

MCQ: 32

Elastin in the walls of the alveoli is destroyed due to

  1. smoker's cough
  2. enlargement of right side of the heart
  3. decreasing in pulmonary artery occurs
  4. enzyme secreted by phagocytes in an attempt to get rid of bacteria settling in the lining of lungs

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