Question

mention two structural features of small intestine which add to absorptive capacity

Answer 1

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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.

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Answer 2

Answer:

1.in small intestine villi increases the surface area for absorption.

2. The small intestine is long which ensures that food remains in the small intestine long enough for the products of digestion to be fully absorbed into the bloodstream.

Explanation: