 Well, in this module, there is, which is gastrointestinal mutility because when it is engulfed, it will move down, it will move down up to the rectum and then to the digestion, the entire process, okay, fecal matter that comes out. So in this process, it all that is, it is with any organ, the function of the gastrointestinal tract is determined with the type of tissue it contains because there are muscles in it, we see that there are different types of layers in the GI tract and right from mouth to anus, these are almost the same as those intestinal tissues and with these movements, food that will move along the intestine. Now most of the mammalian intestinal gastrointestinal tract has the same anatomical structure along the entire length of the GI tract that is now this from the outside inward, outside that is the cirrhosis and then after that the next to it is the muscular layer of the muscles which means there is the inner gland circular and the outer longitudinal muscles, these are the longitudinal muscles, these are the outer muscles whereas these are the inner muscles. Next is the submucosa, this part is which is orange in color and then the mucosa, in the mucosa, so there is the inner cavity, so it is just like a pipe and the wall of the pipe is different from the layers. Now from the outside, from the outside inward, there is a thin layer of connective tissue called cirrhosis. The cirrhosis forms a moist epithelial sheet called the epithelium that is peritonium and this peritonium lines not just the intestinal, you can say the covering, the covering of the intestine as we said earlier and along with it it lines on the body cavity. This peritonium lines the entire abdominal cavity and covers all that is internal organs as we said before. Now next is the layer which is the muscle layers and these are the longitudinal muscles and then the circular muscles and these two muscles have a high coordination and due to any coordination and due to the activity of these muscles, food moves along the intestine. If there is no coordination, then the peristaltic or pushing of the food that will be blocked and the food will stop there and that is literally very problematic then. So these submycosa contains connective tissue, food, blood and lymphatic vessels. These things when we see this thing microscopically, these things become clear and we have to make sure that when we study the villi, all these things become clear. Now the mycosa that faces the central cavity which is called as the lumen, that cavity is called as lumen and this coordination is under the control of the brain, that is the parasympathetic nervous system which controls it and this is the process of automation because our job is only to make the lumen and chew it. This is all voluntary activity and after that when we swallow the food, it is all under automation and then we don't know how this food moves. Now when we study, we know that otherwise if an ordinary person asks us where is the food then we don't know, we just ate it, that's all. But the movement and the digestion process is all something involuntary and this is what is automation and this is a natural process, it is a marvelous process. Now the coordinated contractions of the muscle layers of the gastrointestinal tract, mix the food material with various secretions and the two types of this movement, like gastrointestinal motility, which is involved peristalsis and then segmentation, this is all about in this module.