Question

How are the alveoli designed to maximise the change of gases?

Answer 1

alveoli have branches of many capillaries and they are balloon like structures which are filled with o2    

deoxygenated blood from all over body comes and gets oxygenated here and supplied again to the body.

Answer 2

♤ In the lungs, the air passage that divides into smaller and smaller tubes called bronchi which form bronchioles .

♤ The bronchioles terminate in the balloon like structure called alveoli.

♤ 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 facilitate exchange of gases.