Question
How are the lungs designed in human beings to maximise the area for exchange of gases?
Solution
The lungs of human beings are designed to maximise the area for the gaseous exchange in the following way
i. In the lungs, the air passage (wind pipe) is divided into smaller tubes, called bronchi which in turn form bronchioles.
ii. The bronchioles which terminate in balloon-like structures, called alveoli .
iii. 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 falicitate exchange of gases.
