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How are alveoli designed for maximum exchange of gases?
The tubules have a balloon-like structure in which the oxygen gas is transferred, it has a surface in which the exchange of gases takes place. In the wall of the alveoli there is a very wide network of blood vessels. The CO2 brought from the body through the blood gives to the alveoli. The blood of the alveolar blood vessel carries oxygen from the air to all the cells of the body.
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