the site of secretion of h+ and cl-
Parietal cells
title: Secretion text: Secretion Secretion is the movement of material from one point to another, e.g. secreted chemical substance from a cell or gland. In contrast, excretion, is the removal of certain substances or waste products from a cell or organism. The classical mechanism of cell secretion is via secretory portals at the cell plasma membrane called porosomes. Porosomes are permanent cup-shaped lipoprotein structure at the cell plasma membrane, where secretory vesicles transiently dock and fuse to release intra-vesicular contents from the cell. Secretion in bacterial species means the transport or translocation of effector molecules for example: proteins, enzymes or toxins (such as title: Secretion text: cells. release of vesicles has been demonstrated as a general response to stress conditions, the process of loading cargo proteins seems to be selective. In some "Staphylococcus" and "Streptococcus" species, the accessory secretory system handles the export of highly repetitive adhesion glycoproteins. Secretion Secretion is the movement of material from one point to another, e.g. secreted chemical substance from a cell or gland. In contrast, excretion, is the removal of certain substances or waste products from a cell or organism. The classical mechanism of cell secretion is via secretory portals at the cell plasma membrane called porosomes. Porosomes are permanent title: Gastrointestinal physiology text: largest component of secreted fluids is ions and water, which are first secreted and then reabsorbed along the tract. The ions secreted primarily consist of H, K, Cl, HCO and Na. Water follows the movement of these ions. The GI tract accomplishes this ion pumping using a system of proteins that are capable of active transport, facilitated diffusion and open channel ion movement. The arrangement of these proteins on the apical and basolateral sides of the epithelium determines the net movement of ions and water in the tract. H and Cl are secreted by the parietal cells into the lumen title: Gastrin text: Gastrin Gastrin is a peptide hormone that stimulates secretion of gastric acid (HCl) by the parietal cells of the stomach and aids in gastric motility. It is released by G cells in the pyloric antrum of the stomach, duodenum, and the pancreas. Gastrin binds to cholecystokinin B receptors to stimulate the release of histamines in enterochromaffin-like cells, and it induces the insertion of K/H ATPase pumps into the apical membrane of parietal cells (which in turn increases H release into the stomach cavity). Its release is stimulated by peptides in the lumen of the stomach. In humans, the "GAS" gene title: Gastric glands text: release of histamine is stimulated by the secretion of gastrin from the G cells. Histamine promotes the production and release of bicarbonate ions from the parietal cells to the blood and protons to the stomach lumen. When the stomach pH decreases(becomes more acidic), the ECLs stop releasing histamine. The G cells are mostly found in pyloric glands in the antrum of the pylorus; some are found in the duodenum and other tissues. The G cells secrete gastrin. The gastric pits of these glands are much deeper than the others and here the gastrin is secreted into the bloodstream not the