The inner lining of the small intestine has numerous finger like projections. What are they called ?
List their functions.
CBSE Class X Science SA 2 (3 Marks)
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Vili
(a) Villi are richly supplied with blood vessels which take the absorbed food to each and every cell of the body.
(b) It also absorbs water.
(c) They increase the surface area for the absorption of food.
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Answer:
Intestinal villi (singular: villus) are small, finger-like projections that extend into the lumen of the small intestine. Each villus is approximately 0.5–1.6 mm in length (in humans), and has many microvilli projecting from the enterocytes of its epithelium which collectively form the striated or brush border. Each of these microvilli are much smaller than a single villus. The intestinal villi are much smaller than any of the circular folds in the intestine.
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