What is the relationship between intestinal villi structure and digestion and absorption

The structure of small intestine villi is closely related to digestion and absorption function, mainly reflected in increasing surface area, digestive juice secretion and endocrine function.

1. Increasing surface area

Small intestine villi greatly increase the internal surface area of small intestine, which significantly expands the contact area between food and digestive enzymes and absorption cells, which helps to improve digestion and absorption efficiency.

2. Digestive juice secretion There

are many secretory cells on small intestine villi, such as intestinal epithelial cells, Grignard cells, etc., which can secrete various digestive juices, such as pepsin, pancreatic lipase, etc., which can promote food digestion and absorption.

3. Endocrine function

Endocrine cells in small intestine villi can also secrete hormones, such as incretin and cholecystokinin, which can regulate the secretion activities of pancreas and liver, and further promote digestion and absorption.