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know which respiratory and digestive system structures increase surface area, where each is found, and why...

know which respiratory and digestive system structures increase surface area, where each is found, and why that is important

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In human respiratory system, there are pouch like air sacs called ALVEOLI.

It is in the alveoli where exchange of gases takes place.

The human lungs have been designed to maximise the exchange of gases as follows :-

There are millions of alveoli in the lungs. The presence of millions of alveoli in the lungs provides a very large area for the exchange of gases.

In human digestive system, It is the small intestine.

The small intestine is especially adapted for absorbing the digested food.

The inner surface of small intestine has millions of tiny, finger like projections called VILLI. The presence of villi gives the inner walls of small intestine a very large surface area. And the large surface area of small intestine helps in rapid absorption of digested food.

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