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Unformatted text preview: + + HCO 3-) - Cl-passing via C1 channels into lumen 1 ) before protein enters stomach, relatively high [H+] 2) when protein enters, it binds with H+ and decreases [H+] 3) decreased [H + ] -> stimulates increased gastrin -> stimulates parietal cells to increase [H + ] - parasympathetic nervous system also stimulates parietal cells - caffeine can also stimulate parietal cells (leads to stomach ulcers) - inhibiting parietal cells by CCK and secretin (later) -pepsinogen + H +-> pepsin (enzyme) - pepsin begins chemical digestion of protein - pepsin inactivated at pH > 5 - peristalsis in stomach achieves mixing and hence some mechanical digestion. - greatest force of contraction provided by the antrum - digestion of carbohydrate via salivary amylase stops due to stomach acidity Gastric Emptying...
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- Fall '09