Question

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

Answer 1

Within the lungs, the air passage divides into smaller and smaller tubes which finally terminate in balloon like structures called alveoli. The alveoli provide a surface where the exchange of gases can take place.

Answer 2

In the lungs the bronchioles terminate in balloon like structure called alveoli.the alveoli contains network of blood cappilaries that increase the surface area for exchange of gases. Lungs are divided into smaller components called alveolar sacs where the major process of gas exchange takes place.