What is the role of the small intestine?

The small intestine

has a large number of small villous structures on the inner wall of the small intestine

. When

food passes through the small

intestine, nutrients are absorbed into the blood and lymphatic system through the intestinal villi.

3

. Regulate intestinal peristalsis. The small

intestine has autonomic nervous system control, and through the contraction and relaxation of the muscle layer to promote food movement in the intestine, help to push food to the next site, and promote the mixing of digestive juices, so as to better digest and absorb food

.