The gastrointestinal system consists of 2 elements, the (GI) tract and also the major biological process accent glands, that embrace the liver and duct gland. This review can solely specialize in the management systems that regulate the varied functions of the alimentary tract. The alimentary tract could be a tube-like structure that extends from the mouth to the orifice. Histologically, the gut consists of 4 main layers: the membrane, that contains animal tissue cells (enterocytes, endocrine cells and others), the plate propria and also the muscularis mucosae; the submucosa; 2 muscle layers, associate inner thick circular layer associated an outer skinny longitudinal layer; and a serosal layer. Functionally, the alimentary tract provides the body, as well as the gut itself, with nutrients, electrolytes and water by acting 5 distinct functions: motility, secretion, digestion, absorption and storage. The gut orchestrates these functions by 2 management systems, intrinsic and extrinsic. The intrinsic system is found between the various layers of the gut, whereas the extrinsic system resides outside the wall of the gut