Question

How is small intestine designed in human beings to maximise the area for absorption of materials?

Answer 1

small intestine is embedded with numerous villi ,it maximize the area for absorption of materials and the cells lining the villi produce numerous microscopic projections called microvilli giving a brush border appearance that increase the surface area enormously

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.