How are the lungs designed in human beings to maximise the area for exchange of gases?

Explanation

There are millions of alveoli in the lungs. The presence of millions of alveoli In the lungs provides a very large area for the exchange of gases. And the availability of large surface area maximises the exchange of gases. For example, if all alveoli from the human lungs are unfolded, they would give an area of about 80 square meter (which is nearly the size of a tennis court).