Question

Explain how lungs are designed in human beings to maximize ojhe area for exchange of gases why does the air passage not collapse when there is no aur in it

Answer 1

Lungs contain millions of alveoli which provide a surface for the exchange of gases. An extensive network of blood vessels is present in the wall of the alveoli. By lifting our ribs and flatten the diaphragm, the chest cavity becomes spacious. Air is sucked into the lungs and alveoli.

They did not collapse due to rings of cartilage

Answer 2

1) Within the lungs , the air passage

divides into smaller and smaller tubes

called bronchi which in turn form

bronchioles . The bronchioles terminate

in balloon-like structures called alveoli .

The alveoli present in the lungs provide

maximum surface for exchange of gases .

The alveoli have vary thin walls and

contain an extensive network of blood

vessels to facilitate exchange of gases .

2) The air passage doesn't collapse when

there is no air in it due to the rings of

cartilage .