Question

The villi in the small intestines are important primarily becasue they _____.

A. Release the acid that stimulates pepsinogen.

B. Store the bile that breaks up fats.

C. Increase surface area and thus absorption.

D. Break up and moisten the food and thus facilitate digestion and absorption.

E. Stimulate neurons that tell your brain when you need to defecate.

Answer 1

Answer : The correct answer is C (Increase surface area and thus absorption)

Explanation : Villi are the finger like projections of the mucosa which are large in number which increases the surface area of the epithilium available for absorption and digestion and gives the intestinal muscosa a velvetty appearence. These microvilli in the small instestine contains several brsu border enzymes that help digest nutrients.