The figure shows photomicrographs of alveoli from 1 a non-smoker (× 200) and 2 a smoker (× 50).

a. Use the photomicrographs to describe how the lungs of this smoker diff er from the lungs of the non-smoker.

b. Smokers whose lungs contain alveoli similar to those shown in photomicrograph 2 have poor health.

i. Describe the symptoms that these people may have.

ii. Explain how the structure of the lungs is responsible for this poor health.

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