本题目来源于试卷: Form and Function B.6 Gas Exchange，类别为 IB生物学
[问答题]
Ventilation and lung hlljroa 27/-/azha -x structure play important rom w6t.tyonfx c( : 94uc4+cpkzles in gas exchange which is needed for cellular respiratik 4 c( c4xu wtz+9otc6myf.n:pon.
1.State one possible cause of emphysema and outline the symptoms of the disease.
2.Describe the lungs of an emphysema patient.
3.Explain how muscles bring about pressure changes in the thorax during ventilation.
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