Answer briefly: (a) Why are villi present in the intestine and not in the stomach?
The inner lining of the small intestine is known as submucosa that is thrown into many folds. The mucosa has many projections called villi. These villi are 0.5 to 1.5 mm long and leaf-shaped in the duodenum and become finger-like in the ileum. Villi have a rich supply of blood vessels that receive the product of digestion after absorption. Villi increase the surface area for the absorption of digestive products. The small intestine needs villi to hold fast. The food particles enter from the stomach for absorption. Absorption does not occur in the stomach; thus, villi are present in the small intestine, not in the stomach. The villi are small finger-like projections present in the intestine. These finger-like projections increase the surface area absorption of food after digestion. Digestion occurs in the stomach, but absorption occurs in the small intestine. Thus villi’s are present in the small intestine, not in the stomach.
