Question

Villi are present in the intestine and not in the stomach. Give reasons.

Answer 1

Hint: Villi (one is called a villus) are tiny, finger-shaped structures that increase the surface area. They have several important characteristics like their wall is one cell thick, secondly they have a network of blood capillaries and their internal structure is called a lacteal.

Complete Answer:
- The stomach functions to start the digestive process and to pass partially digested nutrients via a rhythmic contraction to the small intestine so that the intestines can process it.
- The stomach gathers the food, includes gastric juices and chemicals for absorption of food.
- The stomach doesn't retain any nutrients and subsequently doesn't need a bigger surface region.
- The chief function of the small intestine is digestion and absorption of nutrients. Villi of the small digestive system are little finger-like projections on a superficial level.
- One villus contains numerous cells and subsequently increments the surface region. This is required on the grounds that a great deal of nutrients must be absorbed up in the small intestine of the digestive tract.

Note: Villi are available in the small digestive system to expand the surface region of ingestion. Since in the stomach, the digestion is yet to finish there is no point of absorption in stomach while in small digestive system processing is finished and the retention of nutrients is consequently greatest.