s cell s cell s cells are cells which release secretin, found in the jejunum and duodenum. they are stimulated by a drop in ph to 4 or below in the small intestine's lumen. the released secretin will increase the secretion of bicarbonate (hco3−) into the lumen, via the pancreas. this is primarily accomplished by an increase in cyclic amp that activates cftr to release chloride anions into the lumen. the luminal cl− is then involved in a bicarbonate transporter protein exchange, in which the chloride is reabsorbed by the cell and hco3− is secreted into the lumen. s cells are also one of the main producers of cyclosamatin. physiology of the gastrointestinal systemgi tractupperexocrine chief cells pepsinogen parietal cells gastric acid intrinsic factor foveolar cells hco3− mucus goblet cells mucus processes swallowing vomiting fluids saliva gastric acid gastric acid secretion: gastrin g cells histamine ecl cells somatostatin d cells lowerendocrine/paracrinebile and pancreatic secretion: enterogastrone cholecystokinin i cells secretin s cells glucose homeostasis (incretins): gip k cells glp-1 l cells endocrine cell types: enteroendocrine cells enterochromaffin cell apud cell fluids intestinal juice processes segmentation contractions migrating motor complex borborygmus defecation enteric nervous system submucous plexus myenteric plexus either/bothprocesses peristalsis (interstitial cell of cajal basal electrical rhythm) gastrocolic reflex digestion enterocyte accessoryfluids bile pancreatic juice processes enterohepatic circulation abdominopelvic peritoneal fluid s celldetailslocationjejunum and duodenumfunctionsecretin secretionidentifierslatinendocrinocytus sthh3.04.02.0.00037 fma62936anatomical terms of microanatomy this article is issued from wikipedia. the text is licensed under creative commons - attribution - sharealike. additional terms may apply for the media files.