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Small intestine : major site of absorption. Symptoms can manifest in a variety of ways and features might give a clue to the underlying condition. Symptoms can be intestinal or extra-intestinal - the former predominates in severe malabsorption. [citation needed] Diarrhoea, often steatorrhoea, is the most common feature. Watery, diurnal and ...
“Vitamin B12 deficiency can cause ... secreted by cells in the stomach which is vital for the transport of B12 from the stomach to the last part of the small intestine, where it is absorbed ...
The small intestine or small bowel is an organ in the gastrointestinal tract where most of the absorption of nutrients from food takes place. It lies between the stomach and large intestine, and receives bile and pancreatic juice through the pancreatic duct to aid in digestion. The small intestine is about 5.5 metres (18 feet) long and folds ...
In fish, the divisions of the small intestine are not as clear and the terms posterior intestine or distal intestine may be used instead of ileum. [2] Its main function is to absorb vitamin B 12 , bile salts , and whatever products of digestion that were not absorbed by the jejunum .
When foods containing B 12 are eaten, the vitamin is usually bound to protein and is released by proteases released by the pancreas into the small bowel. Following its release, most B 12 is absorbed by the body in the small bowel after binding to a protein known as intrinsic factor.
Coeliac disease is an autoimmune disorder of the small intestine. This can cause vitamin deficiencies due to the improper absorption of nutrients in the small intestine. The small intestine can also be obstructed by a volvulus, a loop of intestine that becomes twisted enclosing its attached mesentery.
This causes gas and other uncomfortable symptoms. Cholera toxin may increase the secretion or decrease the intake of water and electrolytes, leading to possibly severe dehydration and electrolyte imbalance. [2] Rotavirus selectively invades and kills mature enterocytes in the small intestine. [3]
Impaired absorption can also result from blind loop syndrome where an overpopulation of bacteria in the small intestine absorb the vitamin. [126] B 12 deficiency caused by Helicobacter pylori was positively correlated with CagA positivity and gastric inflammatory activity, rather than gastric atrophy.