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 structure play important roles in g oax 68h0 efrkrvw48q/ ;8ryzlas xp +8d z;d(o.aciv .8// ypzhv*qkbgrexchange which is needed for cellulipv.rdoy8x /+d;z8zvpkc a*g b q/.(har respiration.
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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