The intestine is the most important part of the digestive tract of higher multicellular animals including humans. It extends from the stomach porter to the anus, with the stomach, esophagus and oral cavity in front of it.
Carnivores have a very short intestine, as meat can be easily digested. Omnivores have a longer intestine, because plant food is digested more slowly. The longest intestines have herbivores, because digesting plant fibres takes a lot of time. The intestine looks similar to a tube, which is composed of different sections and laid in loops.
The sections are called small intestine, large intestine and rectum. The small intestine is about five meters long and 2.5 centimeters thick in adults. The valuable nutrients are also released into the blood through the intestinal wall. All that remains is an aqueous porridge of substances that cannot be digested.
The large intestine is twice as thick as the small intestine, but only about one and a half meters long. The large intestine leads upwards in the stomach first on the right side, then transversely on the left side and then again downwards into a bent section. Billions of bacteria live in the warm, moist colon. Some even make useful vitamins.
The rectum is connected to the large intestine. Some also call it the rectum.