Question

how are alveoli designed to maximize the exchange of gases

Answer 1

They have thin-walled balloon-like structure. The alveoli provide a surface extensively supplied with blood capillaries for exchange of gases in lungs.Carbon dioxide released in the cavity of alveoli and oxygen is taken by hemoglobin present in RBC of blood.

Answer 2

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 .