Question

how are the lungs designed in human body to legs maximize the area of during respiration

Answer 1

there are millions of alveoli in the lungs .The presence of these in the lungs provides a very large area for exchange of gases.And the availability of large surface area maximises the exchange of gases.
I hope this will help u

Answer 2

♤ In the lungs, the air passage that divides into smaller and smaller tubes called bronchi which form bronchioles .

♤ The bronchioles terminate in the balloon like structure called alveoli.

♤ The alveoli present in the lungs provide maximum surface for exchange of gases.

♤ The alveoli have very thin walls and contain an extensive network of blood vessels to facilitate exchange of gases.