The small intestine has millions of tiny finger-like projections called villi. These villi increase the surface area for more efficient food absorption. Within these villi, are present numerous blood vessels which absorb the digested food and carry it to the blood stream. It is hence from the blood stream, the absorbed food is delivered to each and every cell of the body.

The small finger like projection in small intestine is called villi....It increases the surface area nd helps in absorbtion of food...

Villi
Villi are small, finger-like projections that protrude from the lining of the small intestine. They are tiny structures that increase the surface area of the intestinal wall, aiding in the absorption of nutrients from food.

Location
Villi are located in the small intestine, specifically in the mucous membrane of the lining. They are most abundant in the duodenum and jejunum, the first two parts of the small intestine.

Function

Increase surface area: Villi greatly increase the surface area of the small intestine, providing a larger area for absorption of nutrients such as sugars, amino acids, and fatty acids.

Absorption of nutrients: The villi contain blood vessels and lacteals (lymphatic vessels) that absorb nutrients from digested food. These nutrients are then transported to the bloodstream for distribution to the rest of the body.

Secretion of enzymes: Villi secrete enzymes that aid in the digestion of food. These enzymes help break down complex nutrients into simpler forms that can be absorbed more easily.

Protection: Villi help protect the intestinal lining by trapping and removing harmful substances before they can enter the bloodstream.
In conclusion, villi play a crucial role in the absorption of nutrients in the small intestine by increasing the surface area available for nutrient absorption, secreting enzymes for digestion, and aiding in the protection of the intestinal lining. Their unique structure and function are essential for proper digestion and nutrient absorption in the human body.