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Doctors Medicines MCQs Q&A

With reference to the long hair of small intestine, study the statements given below. I. These are finger-like erect structures and their number is in the thousands. II. Their wall is very thin. III. In these, a network of microscopic blood vessels is spread near their surface. IV. They have fine pores through which food can easily pass through. Of these, the statements that enable the long hair to absorb digested food are:

With reference to the long hair of small intestine, study the statements given below. I. These are finger-like erect structures and their number is in the thousands. II. Their wall is very thin. III. In these, a network of microscopic blood vessels is spread near their surface. IV. They have fine pores through which food can easily pass through. Of these, the statements that enable the long hair to absorb digested food are: Correct Answer I, II and III

Concept:-

  • Finger-like projection (long hair) is present in the small intestine called villi.

Villi:

  • The small intestine has numerous finger-like projections called villi.
  • These villi increase surface area for absorption.
  • Villi have microvilli, which further increase surface area.
  • They have thin walls and are mostly covered with the thin channel of blood capillaries.
  • They have very tiny walls; the role of these walls is to pass digested nutrients through diffusion. 

Related Questions

Study the following statements with reference to the villi of small intestine: (A) They are finger - like outgrowths and thousands in number: (B) They have very thin walls. (C) They have a network of thin and small blood vessels close to the surface. (D) They have small pores through which food can easily pass. The statements which enable to villi to absorb the digested food are
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  1. I. the filling of fine soil pores with water, which reduces capillary forces
  2. II. moistened soil, clay particles to swell and reduce the size of pores
  3. III. raindrop impact breaking up with soil clumps, splashing fine particles into pores