Intestine

The intestine is the portion of the alimentary canal extending from the stomach to the anus and, in humans and mammals, consists of two segments, the small intestine and the large intestine. In humans, the small intestine is further subivided into the duodenum, jejunum and ileum while the large intestine is subdivided into the cecum, colon and rectum.

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The intestine is the part of the body responsible for extracting nutrition from food. While the stomach's role mainly consists in "breaking" food molecules into nutrients, the intestine allows these nutrients to enter the blood via its dedicated membrane.

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The small intestine has a particular folded texture in order to increase the surface area available for diffusion of nutrients through the intestinal wall so they can be absorbed. These microscopic folds are called microvilli. In an adult human, the small intestine is, on average, about seven meters long.

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The large intestine hosts several kinds of bacteria that deal with molecules the human body is not able to destroy itself. This is an example of symbiosis. These bacteria also account for the production of methane inside our intestine (which is released as flatulence when removed through the anus).

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Alimentary canal: REDIRECT Human gastrointestinal tract...

Stomach: In anatomy, the stomach (in ancient Greek στόμαχος) is an organ in the alimentary canal used to digest food. Generally, the stomach's primary function is not the absorption of nutrients from digested food; this task is usually performed by the intestine....

Anus: In anatomy, the anus is the external opening of the rectum. Closure is controlled by sphincter muscles. Feces are expelled from the body through the anus during the act of defecation, which is the primary function of the anus. Most animals — from simple worms to elephants and humans — ha...