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Q.

Many projections on the inner wall of small intestine mainly function to

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a

secrete HCl and digestive enzymes

b

increase the surface area of absorption

c

decrease the liquefaction of food

d

hold mucus so ulcers do not form

answer is B.

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Detailed Solution

Small finger-like foldings in the small intestine are called villi. The cells lining the villi produce numerous microscopic projections called microvilli giving a brush border appearance. These modifications increase the
surface area enormously.

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