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Feature:Air sac is richly supplied with blood capillaries//numerous dense capillary networkAdaptation:-Substances absorbed can be transported away-So as to maintain a steep concentration gradient across the wall of air sacs- increase gas exchange efficiencyFeature:Many air sac folded into alveoliAdaptation:Increase surface area for gas exchangeFeature:-Wall of air sac and capillaries are both one-cell thick(1)/ very thin-air sac are in close contact with capillariesAdaptation:Shorten diffusion distances of passage of gases for gas exchange
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