Question

1) How are the lungs designed in human beings to maximise the area for exchange of gases?

2) Give the role of liver in the human beings?


#Life processes

Answer 1

2.ans:•The liver is a large,meaty organ
•It is present in the right side of the stomach
•It weighs around 3 pounds
•It is reddish brown in color

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.