Question

How are the alveoli designed to maximisethe exchange of gases

Answer 1

The alveoli have the following structures for efficient and maximum gaseous exchange-
→ Walls are extremely thin.
→ Larger surface area in relation to their volume.
→ Fluid lined enabling gases to dissolve.
→ They are surrounded by numerous blood capillaries. 

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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 .