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How do villi make absorption more effective in the small intestine?

Answer and explanation

Correct answer: They increase surface area

The governing concept is adaptation of structure for efficient absorption. Villi are numerous finger-like projections on the inner lining of the small intestine. Together they greatly increase the available surface area, allowing more digested nutrients to contact the absorptive lining at the same time. Their thin epithelium and nearby blood capillaries further support transfer into the blood. Therefore option A is correct; villi do not make acid, pump blood, or fill lungs with air.

Related tags

VilliSurface-AreaAbsorptionLife ProcessesWorld Of LivingScienceClass 10 Mcq

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