mention 2 structural features of small intestine which imparts it the absorptive capacity
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The plicae circulares and villi & microvilli.
Explanation:
The major portion of digestion and absorption of ingested food occurs in the small intestine (approximately 80% of all major nutrient is absorbed here) . Small intestine (SI) is about 21 feet in length. So actually plenty of space.
But to increase its capacity of absorption the wall of SI is thrown into a series of folds. These folds actually increases the surface area. These are called PLICAE.
The innermost layer of the wall of SI, the mucosa contains 4 to 5 million microscopic finger like projections. These are VILLI. Each villi has in its core a capillary network to pick up absorbed nutrients.
In addition, each of the epithelial cells in the surface of the villi has a brush border of MICROVILLI. It further increases the capacity of absorption.
Explanation:
The major portion of digestion and absorption of ingested food occurs in the small intestine (approximately 80% of all major nutrient is absorbed here) . Small intestine (SI) is about 21 feet in length. So actually plenty of space.
But to increase its capacity of absorption the wall of SI is thrown into a series of folds. These folds actually increases the surface area. These are called PLICAE.
The innermost layer of the wall of SI, the mucosa contains 4 to 5 million microscopic finger like projections. These are VILLI. Each villi has in its core a capillary network to pick up absorbed nutrients.
In addition, each of the epithelial cells in the surface of the villi has a brush border of MICROVILLI. It further increases the capacity of absorption.
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━━━━━━━━━━━━━━━⤵
Features of small intestine which imparts it the absorptive capacity are:-
(1) It's cells contain microvilli, which are tiny hair-like projections that increase nutrient absorption.
(2) Water and lipids are absorbed by passive diffusion throughout the small intestine.
♦♦The small intestine is the part of the intestines where 90% of the digestion and absorption of food occurs.
━━━━━━━━━━━━━━━⤵
Features of small intestine which imparts it the absorptive capacity are:-
(1) It's cells contain microvilli, which are tiny hair-like projections that increase nutrient absorption.
(2) Water and lipids are absorbed by passive diffusion throughout the small intestine.
♦♦The small intestine is the part of the intestines where 90% of the digestion and absorption of food occurs.
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