Question

How are alveoli designed to maximize the surface area for exchange of gases?

Answer 1

Hii.. bro! 
Each Alveolus is made up of single squamous epithelial cells, which are very thin and have flattened shape having large surface area to increase the rate of diffusion.

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Answer 2

Actually..Alveolus is made up of single squamous epithelial cells, which are very thin and have flattened shape having large surface area to increase the rate of diffusion.that's why