Small Intestine and its Parts

The small intestine is a long, narrow tube-like structure that is part of the digestive system. It is responsible for the majority of nutrient absorption that occurs in the digestive tract. The small intestine is divided into three main parts, namely, the duodenum, jejunum, and ileum.

Duodenum

The duodenum is the first part of the small intestine, and it is where the majority of chemical digestion occurs. It receives partially digested food from the stomach and secretions from the liver and pancreas, which help to break down food further. The duodenum is approximately 25 cm long.

Jejunum

The jejunum is the middle part of the small intestine, and it is where the majority of nutrient absorption occurs. The walls of the jejunum are lined with finger-like projections called villi, which increase the surface area available for nutrient absorption. The jejunum is approximately 2.5 meters long.

Ileum

The ileum is the final part of the small intestine, and it is where the absorption of remaining nutrients and water occurs. The ileum is also lined with villi, and it connects to the large intestine at the ileocecal valve. The ileum is approximately 3.5 meters long.

Conclusion

In conclusion, the duodenum, jejunum, and ileum are all parts of the small intestine. The duodenum is responsible for chemical digestion, while the jejunum and ileum are responsible for nutrient absorption. The small intestine as a whole is a crucial part of the digestive system, and it plays a vital role in maintaining overall health and well-being.