The gastrointestinal, or GI, is a system composed of several composite structures, all members of the conversion of food into nutrients are assimilated dall’organisno appropriate. In fact, food can reach the cells are not without first changing physically and chemically, ie, separated by undigested gut substances. make it easier to see the gastrointestinal tract, it can be absorbed by the food, the road thinking it was the MOUTH starts with throat still often called by the neck, foods are mixed after chewing and swallow saliva crushed, the obtained suspension, called bolus. After the pharynx, the bolus decreases along a cable and an element of the esophagus, an approximately 30 cm long channel in practice extending between the groove and the elongated stomach. the crossing point between the esophagus and the stomach became known for sphincter cardia. the sphincter muscle sphincter is a structure surrounding the sleeve has a channel or opening in accordance with muscle contraction fibers. Passing state by opening and closing the cardia natural body finally allows the bowl is in the stomach, which is still time to be digested. digestion word comprises a number of different methods, in particular for the different substances, fats, sugars, proteins, forming the food. Bolus called chyme turned a creamy semi-solid mass, stomach and through the pylorus into the duodenum, long about 25 cm, which is the first part of “INTESTINE composed by fasting and by” ileus. The small intestine is a 07.06 m long channel with a diameter of about 3 cm, that most of the abdominal cavity is achieved, occupies a complete digestion and absorption of nutrients. crossed at the end of the long road that remains within the lumen of the intestine after the entire length of the colon or large intestine that calls from several parts blind, ascending colon, transverse colon, descending colon, sigmoid colon is, and anus, they are sold in the form of stools through the anal sphincter. The structure of the gastrointestinal tract with obvious common features of the esophagus to the anus. It basically consists of a muscular tube with a membrane that lines soft pink mucosa called search. available to the muscular component remains constant, while the mucosa shows differences in the various regions of the device, according to the functions of the various bodies that have worked. It consists of an epithelial tissue in the glands are issued directly secreting substances produced in the digestive tract. In the mucous membrane is generally a protective function, secretion and absorption part. In addition to the muscular is mucosa and the wall of the gastrointestinal tract of the other two layers, the sub mucosa or serosa and the tunica adventitia, which is the outermost layer. The digestive system also contains the organs through which food, salivary glands, liver, gallbladder or pancreas and gallbladder.