the walls of the air sacs and the capillaries are both very thin .Suggest how this helps gas exchange take place quickly?
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44
Answer:
An individual air sac is called an alveolus. The layer of moisture in the alveoli allows gases to dissolve so that they can diffuse quickly. The alveoli have a very large total surface area and a very good blood supply, provided by the dense network of capillaries that surround them.
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18
Answer:
Thin walls of air sacs and capillaries means diffusion of gases easily takes place. This increases the rate of exchange of gases.
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