Question

how are the alveoli designed to maximise the exchange of gases

Answer 1

1. They are circular in shape, which increases surface area for exchange of gases.

2. They have a extensive network of fine blood capillaries to facilitate the exchange of gases.

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.