<prompt> Histamine is secreted by:Enterochromaffin cellParietal cellOxyntic cellChief cell  <response>: - ECL cells lie in deep recesses of oxyntic glands is associated with parietal cells of glands - Under influence of gastrin secreted by G-cells, ECL cells release Histamine directly to deep oxyntic gland. Then histamine acts quickly to stimulate Hcl secretion Parietal cell oxyntic cell: - Present in body of stomach secrete Hcl intrinsic factor B12 vit absorption - PH of this acid is about 0.8 3 million times PH of aerial blood - Main driving force of Hcl secretion Hydrogen-potassium pump H - K adenosine triphosphatase - HCL secretion is under regulation of Endocrine gastrin Neurocrine Vagus Ach Paracrine ECL Histamine - Chief peptic cells Secrete large quantities of pepsinogen 