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 HCO₃^- into the lumen, via the pancreas.

For more information on the function of S cells, see article secretin.

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v • d • e Digestive system, physiology: gastrointestinal physiology

Enteric nervous system	Meissner's plexus - Auerbach's plexus

Exocrine	Chief cells (Pepsinogen) - Parietal cells (Gastric acid, Intrinsic factor) - Goblet cells (Mucus)

Endocrine/paracrine	G cells (gastrin), D cells (somatostatin) - ECL cells (Histamine) - enterogastrone: I cells (CCK), K cells (GIP), S cells (secretin), Enteroendocrine cells

Border	Brunner's glands - Paneth cells - Enterocytes

Fluids	Saliva - Bile - Intestinal juice - Gastric juice - Pancreatic juice

Processes	Swallowing - Vomiting - Peristalsis (Interstitial cell of Cajal) - Migrating motor complex - Borborygmus - Gastrocolic reflex - Segmentation contractions - Defecation

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