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प्रश्न
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.
पर्याय
(i), (ii) and (iv)
(ii), (iii) and (iv)
(iii) and (iv)
(i) and (iv)
उत्तर
(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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संबंधित प्रश्न
Why does absorption of digested food occur mainly in the small intestine?
The longest part of alimentary canal is ______.
How is the small intestine designed to absorb digested food?
The enzyme responsible for the digestion of proteins in the small intestine is _____________.
The finger-like outgrowths of Amoeba help to ingest food. However, the finger-like outgrowths of the human intestine help to
Name the parts of the alimentary canal where
digested food gets absorbed
Match the organs in Column I with the words listed in Column II.
| Column I | Column II | ||
| (a) | Rectum | (i) | Mucus |
| (b) | Gall bladder | (ii) | Villi |
| (c) | Stomach | (iii) | Taste buds |
| (d) | Tongue | (iv) | Faeces |
| (e) | Small intestine | (v) | Bile juice |
Finger-like projections enhance the absorbing capacity of the small intestine.
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.
