Question

mention any two features of villi that enable it to perform its functions

Answer 1

• Villi are single cell thick.

• Villi have rich network of blood capillaries .

• Most important is: Apical membranes of Villi further form many finger-like projections called microvilli or brush borders.

• Villi have permeable membranes .

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Answer 2

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Following are the salient adaptations of villi that make them good absorbers:

Villi are single cell thick. Thus nutrients don't have to travel longer distance in order to diffuse into bloodstream. This increase the rate of diffusion. Hence absorption rate is also increased.

Villi have rich network of blood capillaries . Thus a steep concentration gradient is maintained between inside of small intestine and blood.

Most important is: Apical membranes of Villi further form many finger-like projections called microvilli or brush borders. Villi together with it's microvilli tremendously increase surface area of absorption. And hence supports effective absorption of nutrients into blood.

Villi have permeable membranes . Thus, nutrients can easily get their way through