Small intestine is 4-6 meters long and is located between the stomach and colon. Its main features are the inclusion of the nutrient from food, transport of food. Moreover, the small intestine some immune function.
Small intestine is composed of a mucous membrane, surrounded by layers of muscles. Mucosa acts as a barrier against harmful substances and as the surface for absorption of nutrients. The surrounding muscles are the small intestine in a position to make knownperistalticmovementsThat helps to empty the rectum. In addition, there are other movements, aimed to mix food with digestive enzymes.
Small intestine is folded many times as the inner surface is many times greater than it otherwise would be. There are large folderplicae, These are microscopic finger-like projections,villiAnd on each small intestine cells sitmikrovilli. All of these are folding increases the surface from approx. ½ square meters for up to 200 square meters.
Small intestine divided on the basis of function in three different parts:
Twelve Finger intestine (duodenum)
Twelve Finger intestine are the first 25-30 cm of small intestine just after the stomach. Here food is mixed with bile from the bile ducts and digestive enzymes and insulin from the pancreas (pancreatic). Twelve Finger intestine is often the seat of ulcers, so calledduodenalsår(often included in the term ulcer.
Hunger intestine (jejunum)
The middle 2/5-dele of the small intestine. Here is also secreted enzymes, and a listing of nutrients.
Krum intestine (ileum)
The lower part of the small intestine. This included most of the nutrients. I hooked the intestine, there is bacteria, which helps to absorb some vitamins. There are also areas with cells that are part of the immune system.
This article has been created on Health Guide d. 11.08.06