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Question
The ___ provide a surface where the exchange of gases can take place.
The
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Solution
The alveoli provide a surface where the exchange of gases can take place. The walls of the alveoli are covered by an extensive network of blood-vessels. The gases flow into the alveoli by simple diffusion.
The alveoli provide a surface where the exchange of gases can take place. The walls of the alveoli are covered by an extensive network of blood-vessels. The gases flow into the alveoli by simple diffusion.
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