How do the villi of the small intestine function?   ?
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They have only one real purposre.  First, they dramatically increase the total surface area of your small intestines to help absorb nutrients.  That's why when you get sick and get diarrhea, it's because the illness (virus,bacteria, etc.) has destroyed those villi and decreased the surface area of your intestine and all the stuff you eat just goes right through you.  Second, they say that it assists with motility (moving stuff through) but that isn't really true. You have muscles around your intestines that squeeze in a rythmic pattern and slowly push through section by section.
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If the patient has a functional GI tract (gut) they can be fed using enteral nutrition.  Enteral nutrition consists of infusing formula that contains all the fluids, vitamins, minerals and calories into the patient's stomach or small intestine.\nIf the patient does not have a functional GI tract, they are given TPN (Total Parenteral Nutrition) through an IV.  TPN's consist of Dextrose, Amino Acids, Fat, Electrolytes, Vitamins and Trace Elements.
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The small intestine is a long, narrow, coiled tube extending from the stomach to the large intestine. This is the place where most digestion and absorption of food takes place. The small intestine of a human can be as long as six to eight meters long (20-26 feet), depending on age and size of being. So much length can be compacted into so little space because of the nature of the small intestine; it is coiled and takes up less space, while maintaining it's enormous surface area.\n\nThe large intestine is the posterior or end of the human intestine that consists of four regions the, the cecum, the colon, the rectum and the anal canal. The large intestine is wider but shorter than the small intestine. It measures approximately 1.5 meters (5 feet) in length and its primary function is to absorb water and electrolytes that have already passed unabsorbed through the small intestine.\n\nTogether - the intestines range in length anywhere from 25 - 31 feet.
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Digestive System Organs\n\nEsophagus- A simple conduit between the mouth & stomach.\nStomach- Where the enzymatic digestion of proteins initiated and foods are reducted to liquid form.\nLiver- It's major role is to provide bile salts to the small intestine, which are critical for digestion & absorption of fats.\nPancreas- Important roles as both and endocrine & exocrine organ- provides a potent mixture of digestive ezymes to the small intestine which are critical for digestion of fats, carbs and protein.\nSmall Intestine- Where the final stages of chemical enzymatic digestion occur & where almost all nutrients are absorbed.\nLarge Intestine- Major differences among species in extent & importance - in all animals water is absorbed, bacterial fermentation takes place and feces are formed. In carnivores, that's about the extent of it, but in herbivores; like the horse, the large intestine is huge and of critical importance for utilization of cellulose.\n\nEXCRETORY ORGANS\n\nLUNGS- Diffuses carbon dioxide from the blood, into the lung tissue, and then leaves the body everytime we exhale.\nLIVER- The largest internal organ in our bodies. Its numerous functions make it part of the circulatory, digestive, and excretory systems. Some proteins & other nitrogenous compounds are broken down in the liver by a process called deamination. The liver produces bile, which is temporarily stored in the gall bladder before being released into the small intestine where it helps break down lipid molecules. The liver removes & breaks down old red blood cells. It is also responsible for maintaining normal levels of glucose in the blood. The liver is ALSO responsible for removing potentially hazardous chemicals from the blood. It "detoxifies" the blood.\nSKIN- Sweat comes out of pores in your skin. Sweat is a mixture of 3 metabolic wastes: water, salts, & urea. So as you sweat, your body accomplishes 2 things: sweating has a cooling effect on the body, and metabolic wastes are excreted.\nKIDNEYS- they filter the blood. The kidneys help filter the blood.\n\nRESPIRATORY \n\nNose & Nasal Cavity- airway, moistens & warms air, filters air, resonating chamber for speech, houses smell receptors.\n\nPharynx (throat)- connects nasal cavity to oral cavity & larynx & esophagus. Is a common path for air and food.\n\nLarynx (voice box)- Provides an open airway. Routes food to the esophagus & air to trachea.\n\nTrachea (windpipe)- Descends from larynx & divides into the 2 primary bronchi. Is mobile; stretches, recoils, moves side to side. \n\nLungs- are the collective arrangement of the respiratory zone.
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the best known good role is the normal flora which is the microbes of the skin, intestine.. that are naturally thier some produce antibiotics that kills pathogenic bacteria and some produce vitamins..some lactobacilli produce lactic acid in the vagina and prevent the growth of fungi like Candida albicans
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Here is a good article for you - http://en.wikipedia.org/wiki/Digestive_system.
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In anatomy of the digestive system, the colon or large intestine is the part of the intestine from the cecum to the rectum. Its primary purpose is to extract water from feces. In mammals, it consists of the ascending colon on the right side, the transverse colon, the descending colon on the left side, the sigmoid colon, and the rectum.
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do you mean duodenum? that is the large intestine with the small intestine being the ileum. not sur ewhich enzymes are present in each part, been a while since school. look up human enzymes
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gastro intestinal tract
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The Cardiovascular System\n\n\n The cardiovascular system and the lymphatic system form what is collectively called the circulatory system. Together, these systems transport oxygen, nutrients, cell wastes, hormones, and many other substances to and from all cells in the body. The trillions of cells in the human body take up nutrients and excrete wastes every minute of every day. Although the pace of this exchange may increase with activity or slow with rest, it happens continuously. If it stops, so does life. Of the two systems, the cardiovascular system is the primary transport operator; the lymphatic system aids it in its function.\n\n\nDesign: Parts of the Cardiovascular System\n\nCardiovascular comes from the Greek word cardia, meaning "heart," and the Latin vasculum, meaning "small vessel." The basic components of the cardiovascular system are the heart, the blood vessels, and the blood. The system can be compared to a large muscular pump (the heart) that sends a fluid (blood) through a series of large and small tubes (blood vessels). As blood circulates through the increasingly intricate system of vessels, it picks up oxygen from the lungs, nutrients from the small intestine, and .....
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The gall bladder is a balloon-like sac that connects to the liver and the top of the small intestines. It stores bile, a green substance produced by the liver. Bile assists in the digestion of fats.
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When chyme from an ingested meal enters the small intestine, acid and partially digested fats and proteins stimulate secretion of cholecystokinin and secretin. These control the secretion of bile which is has the following importance:\n\n# Bile contains bile acids, which are critical for digestion and absorption of fats and fat-soluble vitamins in the small intestine.\n\n# Many waste products are eliminated from the body by secretion into bile and elimination in feces.
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Epithelial cells,lymphoid cells, Peyer's patches and Ileal Villi are four distinctive tissue types found in the ileum. Some consider the valvular tissue a separative tissue. See the article linked below.
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30 square meters\nor maybe 50?\nthe large surface area is vital to absorption of assimilated food material, thats why when people have to get a part of the intestine removed they usually develop a deficiency of one or another food group.\nthis large surface area is made possible by the fact that the intestine is long (1,5 meters large and 6 meters small)\nand also by the morphology of the lining of the intestine: there are  trenches called sulci    and  projections called villi  giving the mucosa more area to cover.
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To make sure the gut has as much surface area as possible for the absorption of nutrients, it is:\n- very long,\n- its internal surface is folded, &\n- the internal surface is covered in finger-like projections called villi. On its own, one of these projections is called a villus.
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small intestines only, water is absorbed through the large intestine
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simple colunar epithelium i guess. single layer is to provide absorption and secretion.