Internal organs

Intestine

Intestine


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Together with the mouth and stomach, the intestinal tract is largely responsible for the recycling and disposal of the ingested food. Digestion begins in the mouth with chewing and carbohydrate-decomposing enzymes in the saliva. The food pulp is then passed on to the stomach via the trachea. Here, additional digestive enzymes are added and pathogens are killed by the stomach acid. Then the porridge is passed in portions to the intestine, which takes over most of the digestion.

The small intestine joins the stomach first. This is about five to six meters long and is divided into the three main sections duodenum (duodenum), empty intestine (jejunum) and bowel intestine (ileum). In these sections, the food porridge is further broken down. Nutrients such as carbohydrates, amino acids and fatty acids are filtered out of the intestinal mucosa and released into the blood. At the same time, around 80 percent of the water content is extracted from the porridge, causing it to thicken considerably. In addition, hormones that control various processes of digestion are also released in the small intestine.

The small intestine is characterized by a gigantic number of folds. Around four million wart-like elevations, the so-called intestinal villi, sit in these folds. Due to the complicated folding system of the intestine, it reaches a surface of 400 to 500 square meters on which the food porridge is processed.

The porridge then gets into the large intestine. This is around one meter long and runs like a frame around the folded small intestine. Since most of the nutrients have already been used here, the large intestine largely takes over the disposal of the food pulp, which is processed into feces here. To do this, more water is removed from the porridge and instead a slime is added, which is produced by the so-called goblet cells to make the feces more lubricious. The manure can be stored in the large intestine for up to five days so that it does not have to be released in small portions all the time.

The three to four centimeters long anus forms the end of the intestine. This reinforced muscle layer ensures the gastight closure of the intestine and the final disposal of the feces. Depending on the type of diet, the ingested food stays in the body for an average of 33 to 43 hours. (vb)

Intestine

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(Photo 1: Crystal light / fotolia.com)

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Video: Laparoscopic Lysis of Abdominal Adhesions 2011 (May 2022).