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Question
Read the following statements with reference to the villi of the small intestine.
- They have very thin walls.
- They have a network of thin and small blood vessels close to the surface.
- They have small pores through which food can easily pass.
- They are finger-like projections
Identify those statements which enable the villi to absorb digested food.
Options
(i), (ii) and (iv)
(ii), (iii) and (iv)
(iii) and (iv)
(i) and (iv)
Solution
(i), (ii) and (iv)
Explanation:
Villi are the numerous, small finger-like projections present in the inner walls of the small intestine. Villi increase the surface area of the small intestine for absorption of digested food due to their thin, finger-like shape. Each villus has a network of thin and small blood vessels close to its surface. The food absorbed on the surface of the villus passes into the blood in the capillaries. Villi do not have any pores.
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Assertion (A): The inner walls of the small intestine have finger like projections called villi which are rich in blood.
Reason (R): These villi have large surface area to help the small intestine in completing the digestion of food.
Visit a doctor and find out:
- Under what conditions does a patient need to be on a drip of glucose?
- Till when does a patient need to be given glucose?
- How does glucose help the patient recover?
Write the answers in your notebook.
