The small intestine is the longest part of the digestive tract, about 5 ~ 6 meters, and there are many annular folds on its inner surface. The beginning of the small intestine is equivalent to the length of twelve fingers juxtaposed, so it is called duodenum (see the explanation combined with the wall chart), and the small intestine is the main organ for digestion and absorption.

large intestine

The large intestine is larger than the small intestine, about 1.5m long, and can be divided into three parts: cecum, colon and rectum.

At the beginning of the large intestine (at the junction with the small intestine), there is a downward protruding blind sac called cecum, and there is a finger-like projection at the blind end, that is, appendix. Both cecum and appendix are degenerated organs in human body. The large intestine has a certain absorption function.