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into the lateral intercellular spaces by osmosis via tight junctions and adjacent cells which then in turn moves across the basement membrane and into the capillaries while more sodium ions are pumped again into the intercellular fluid 42 although water travels down an osmotic gradient in each individual step overall water usually travels against the osmotic gradient due to the pumping of sodium ions into the intercellular fluid this allows the large intestine to absorb water despite the blood in capillaries being hypotonic compared to the fluid within the intestinal lumen gut flora edit main article gut microbiota the large intestine houses over 700 species of bacteria that perform a variety of functions as well as fungi protozoa and archaea species diversity varies by geography and diet 43 the microbes in a human distal gut often number in the vicinity of 100 trillion and can weigh around 200 grams 0 44 pounds this mass of mostly symbiotic microbes has recently been called the latest human organ to be discovered or in other words the forgotten organ 44 the large intestine absorbs some of the products formed by the bacteria inhabiting this region undigested polysaccharides fiber are metabolized to short chain fatty acids by bacteria in the large intestine and absorbed by passive diffusion the bicarbonate that the large intestine secretes helps to neutralize the increased acidity resulting from the formation of these fatty acids 45 these bacteria also produce large amounts of vitamins especially vitamin k and biotin a b vitamin for absorption into the blood although this source of vitamins in general provides only a small part of the daily requirement it makes a significant contribution when dietary vitamin intake is low an individual who depends on absorption of vitamins formed by bacteria in the large intestine may become vitamin deficient if treated with antibiotics that inhibit the vitamin producing species of bacteria as well as the intended disease causing bacteria 46 other bacterial products include gas flatus which is a mixture of nitrogen and carbon dioxide with small amounts of the gases hydrogen methane and hydrogen sulfide bacterial fermentation of undigested polysaccharides produces these some of the fecal odor is due to indoles metabolized from the amino acid tryptophan the normal flora is also essential in the development of certain tissues including the cecum and lymphatics citation needed they are also involved in the production of cross reactive antibodies these are antibodies produced by the immune system against the normal flora that are also effective against related pathogens thereby preventing infection or invasion the two most prevalent phyla of the colon are bacillota and bacteroidota the ratio between the two seems to vary widely as reported by the human microbiome project 47 bacteroides are implicated in the initiation of colitis and colon cancer bifidobacteria are also abundant and are often described as friendly bacteria 48 49 a mucus layer protects the large intestine from attacks from colonic commensal bacteria 50 clinical significance edit disease edit main article gastrointestinal disease following are the most common diseases or disorders of the colon angiodysplasia of the colon appendicitis chronic functional abdominal pain colitis colorectal cancer colorectal polyp constipation crohn s disease diarrhea diverticulitis diverticulosis hirschsprung s disease aganglionosis ileus intussusception irritable bowel syndrome pseudomembranous colitis ulcerative colitis and toxic megacolon colonoscopy edit main article colonoscopy colonoscopy image splenic flexure normal mucosa the spleen can be seen through it colonoscopy is the endoscopic examination of the large intestine and the distal part of the small bowel with a ccd camera or a fiber optic camera on a flexible tube passed through the anus it can provide a visual diagnosis e g ulceration polyps and grants the opportunity for biopsy or removal of suspected colorectal cancer lesions colonoscopy can remove polyps as small as one millimetre or less once polyps are removed they can be studied with the aid of a microscope to determine if they are precancerous or not it takes 15 years or fewer for a polyp to turn cancerous colonoscopy is similar to sigmoidoscopy the difference being related to which parts of the colon each can examine a colonoscopy allows an examination of the entire colon 1200 1500 mm in length a sigmoidoscopy allows an examination of the distal portion about 600 mm of the colon which may be sufficient because benefits to cancer survival of colonoscopy have been limited to the detection of lesions in the distal portion of the colon 51 52 53 a sigmoidoscopy is often used as a screening procedure for a full colonoscopy often done in conjunction with a stool based test such as a fecal occult blood test fobt fecal immunochemical test fit or multi target stool dna test cologuard or blood based test sept9 dna methylation test epi procolon 54 about 5 of these screened patients are referred to colonoscopy 55 virtual colonoscopy which uses 2d and 3d imagery reconstructed from computed tomography ct scans or from nuclear magnetic resonance mr scans is also possible as a totally non invasive medical test although it is not standard and still under investigation regarding its diagnostic abilities furthermore virtual colonoscopy does not allow for therapeutic maneuvers such as polyp tumour removal or biopsy nor visualization of lesions smaller than 5 millimeters if a growth or polyp is detected using ct colonography a standard colonoscopy would still need to be performed additionally surgeons have lately been using the term pouchoscopy to refer to a colonoscopy of the ileo anal pouch other animals edit the large intestine is truly distinct only in tetrapods in which it is almost always separated from the small intestine by an ileocecal valve in most vertebrates however it is a relatively short structure running directly to the anus although noticeably wider than the small intestine although the cecum is present in most amniotes only in mammals does the remainder of the large intestine develop into a true colon 56 in some small mammals the colon is straight as it is in other tetrapods but in the majority of mammalian species it is divided into ascending and descending portions a distinct transverse colon is typically present only in primates however the taeniae coli and accompanying haustra are not found in either carnivorans or ruminants the rectum of mammals other than monotremes is derived from the cloaca of other vertebrates and is therefore not truly homologous with the rectum found in these species 56 in some fish there is no true large intestine but simply a short rectum connecting the end of the digestive part of the gut to the cloaca in sharks this includes a rectal gland that secretes salt to help the animal maintain osmotic balance with the seawater the gland 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