Mention any two structural modification of small intestine which help in absorption
Answers
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The small intestine is the place where most part of digestion and absorption happens.
Two structural modifications of small intestine that help to increase rhe absorption capacity are the-
VILLI- The inner lining of the small intestine has numerous finger-like projections called VILLI- which increase the surface area for absorption. The villi are richly supplied with blood vessels, which take up the absorbed food to each and every cell of the body, where it is utilised for obtaining energy, building up new tissues and repair of old tissues.
MICROVILLI- Plasma membrane of each of the epithelial cells lining the villi forms extensions called microvilli (on the inner side of the intestine).
The villi and microvilli greatly increase the surface area of the small intestine.
Apart from these two modifications, there is a third structural modification too, which helps in absorption. These modifications are the 'circular folds' present on the walls of small intestine.
Circular folds are permanent folds on the lumen-facing side of the small intestine. They too help in increasing the surface area for absorption.
Hence, in short, it can be said that the inner walls of small intestine contain circular folds, which contain villi, which in turn contain microvilli.
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Answer:
Two structural modifications of the small intestine which help in absorption are villi and microvilli.
Explanation:
About 80% of food ingested is digested in the small intestine during the digestion process. The small intestine is involved in the absorption of all nutrients of the food.
The small intestine consists of several folds increasing the surface area to absorb nutrients from food.
1. Villi
The mucosa in the inner lining of the small intestine consists of 4 to 5 million fingerlike projections called villi.
2. Microvilli
The villi are composed of epithelial cells on their surface forming numerous brush-like structures known as microvilli which further increases the capacity of absorption.