Question

How are oxygen and carbondioxide transported in human beings how are lungs digested to maximise the area for exchange of gases?

Answer 1

(i) Oxygen enters the human body through the nasal passage and reaches the lungs. (ii) Numerous alveoli are present in the lungs. These alveoli are surrounded by many blood capillaries. ... These alveoli increase the surface area for gaseous exchange, making the process of respiration more efficient.

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.