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