the small intestine

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haemorrhage the small intestine functions of small intestine: 1- completes digestion of food. 2- secretion of intestinal hormones. 3- absorption of digestive food products: the small intestine is considered to be the better site for absorption due to: a- large surface area of absorption. b- rich blood and lymphatic supply. the intestinal secretion the volume of this secretion is about 1 liter per day. it contains the following: 1- alkaline fluid: secreted by the crypts of lieberkuhn. ph is about 7.5. it is isotonic fluid. it contains mainly nacl and nahco3. no digestive enzymes. 2- mucus: this secreted as mucin and then it is hydrated into mucus. it is secreted from: a- brunner's glands: they secrete thick alkaline mucus to protect the duodenum from the highly acidic gastric content that enters into it. * b- goblet cells and surface epithelium: they secrete mucus in response to mechanical or chemical stimulation …

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ion): the circular muscle contracts at several sites, thus dividing a portion of the small intestine into equal segments. a few seconds later, contractions appear in the middle of each segment. the segmentation contractions are myogenic in nature and controlled by the myogenic basic electric rhythm (ber) of the intestine. functions of mixing movements: a- mixing the intestinal contents with digestive secretion. b- increases its exposure to the mucosal surface. 2- propulsive movements (peristalsis): the peristaltic waves move the intestinal contents towards the large intestine. the peristaltic movements are neurogenic. they depend on the integrity of the enteric nervous system. the peristaltic movements are increased after meals due to: 1- distension of the intestine. 2- gastroenteric reflex. 3- released hormones. control of intestinal movements: 1- nervous control: a- the intrinsic nerve plexuses: these are essential for peristalsis and accentuate the segmentation movements. b- the extrinsic nerve supply: sympathetic and vagal …

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haemorrhage the small intestine functions of small intestine: 1- completes digestion of food. 2- secretion of intestinal hormones. 3- absorption of digestive food products: the small intestine is considered to be the better site for absorption due to: a- large surface area of absorption. b- rich blood and lymphatic supply. the intestinal secretion the volume of this secretion is about 1 liter per day. it contains the following: 1- alkaline fluid: secreted by the crypts of lieberkuhn. ph is about 7.5. it is isotonic fluid. it contains mainly nacl and nahco3. no digestive enzymes. 2- mucus: this secreted as mucin and then it is hydrated into mucus. it is secreted from: a- brunner's glands: they secrete thick alkaline mucus to …

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