Cavity in the body of multi-cell animals, which is used for digestion (digestive system); originally a simple cavity with connection to the outside world (coelenterates), then an external canal (intestine canal, colan), which passes through the whole animal (intestine animals, Bilaterien) from a oral opening up to an anus.
Strictly speaking the intestine is the section of the intestine canal, which begins at the stomach and ends at the anus. The intestine length is larger with herbivores than with carnivores (e.g. with cattle 21-times as long as the body, with the cat 4,5-time as long as the body).
In the intestines nutrients are taken out of the fodder mash and released into the blood through the intestine wall, in order to distribute in the body. The human intestine (adult) has a length from 8-9 m and divided into small intestine, large intestine and colan.
It carries the food mash prepared in the stomach by rhythmic pulling together of its lengthwise and circularly arranged musculature (perastalic action) through all its sections to the anus.
From the sheep the duodenum, the gut skin (Jejunum) and the Appendix (Caecum) are used. The duodenum and the gut skin are used not turned inside out, but mucous membrane, muscle layer and serous coats are removed.