Small Intestine

Small intestine is the longest part of the digestive system. Its length is about 6 meters, and its width is around 3 cm. Its main function is completing the digestion and then absorbs the chyme to give the body ENERGY. It receives food from Stomach. Also receiving food from stomach to small intestine is controlled by a muscle, which is pyloric sphincter. The absorption of food, which is the main function, is efficient because of its huge area. The food is absorbed to the blood through villi; also the villi have microvillus that makes the absorption so efficient.

Here is the picture for villi and microvillus where the food is absorbed.