Gastroduodenal mucosal secretion of bicarbonate and mucus: physiological control and role in protection.
Bicarbonate secretion by the surface epithelium in the stomach and duodenum maintains a near neutral pH in the mucus gel adherent to the surface in spite of acidities as high as pH 2.0-3.0 in the gastric and pH 1.5-2.0 in the duodenal lumen. This strongly suggests that the alkaline secretion together with the mucus gel provides a first line of protection in the stomach and this may be the main mechanism of defense in the duodenum. The secretion is increased by physiological stimuli such as sham-feeding or the presence of acid in the lumen. Mucosal endogenous production of prostaglandins as well as humoral and neural mechanisms are involved in the control of the secretion.
D000818:Animals; D001639:Bicarbonates / Q000378:metabolism*; D004386:Duodenum / Q000378:metabolism; D005750:Gastric Juice / Q000378:metabolism; D005753:Gastric Mucosa / Q000378:metabolism*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007413:Intestinal Mucosa / Q000378:metabolism*; D009093:Mucus / Q000378:metabolism*; D011458:Prostaglandins E / Q000494:pharmacology; D012636:Secretory Rate / Q000187:drug effects
D001639:Bicarbonates; D011458:Prostaglandins E