{"id":5361,"date":"2025-12-08T17:53:56","date_gmt":"2025-12-08T22:53:56","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/?post_type=chapter&p=5361"},"modified":"2026-01-12T18:38:38","modified_gmt":"2026-01-12T23:38:38","slug":"10p6-digestive-system-and-fluid-loss","status":"web-only","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/chapter\/10p6-digestive-system-and-fluid-loss\/","title":{"raw":"10p6 Digestive System and Fluid Loss","rendered":"10p6 Digestive System and Fluid Loss"},"content":{"raw":"Digestive System and Fluid Loss<\/strong>\r\n

GI Fluid Production<\/strong><\/h1>\r\n
    \r\n \t
  • The GI tract produces and processes large amounts of fluids daily:\r\n
      \r\n \t
    • Saliva: 1.5 liters.<\/li>\r\n \t
    • Gastric secretions (HCl, enzymes): 1.5 liters.<\/li>\r\n \t
    • Bile: 1 liter.<\/li>\r\n \t
    • Pancreatic enzymes, bicarbonate buffer: 1 liter.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t
    • Most of these fluids are reabsorbed in the small and large intestines, leaving about\u00a0150 mL<\/strong>\u00a0of undigested material and bacteria to be excreted.<\/li>\r\n<\/ul>\r\n

      Causes of Fluid and Electrolyte Imbalances<\/strong><\/h1>\r\n
        \r\n \t
      • Dehydration<\/strong> occurs with excessive vomiting or diarrhea:\r\n
          \r\n \t
        • Leads to\u00a0hypovolemia<\/strong>\u00a0(low blood volume).<\/li>\r\n \t
        • Results in\u00a0low blood pressure<\/strong>\u00a0and\u00a0poor tissue perfusion<\/strong>.<\/li>\r\n \t
        • Causes\u00a0intracellular dehydration<\/strong>, impairing cell function.<\/li>\r\n \t
        • Can be\u00a0fatal<\/strong>\u00a0if not managed.<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t
        • Electrolyte loss<\/strong>:\r\n
            \r\n \t
          • Sodium<\/strong>\u00a0and\u00a0chloride<\/strong>\u00a0lost through vomiting (gastric HCl).<\/li>\r\n \t
          • Sodium and potassium<\/strong>\u00a0lost via diarrhea.<\/li>\r\n \t
          • Loss causes\u00a0alkalosis<\/strong>\u00a0if HCl is lost, or\u00a0acidosis<\/strong>\u00a0if bicarbonate is lost.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n

            Causes of Acid-Base Imbalances<\/strong><\/h1>\r\n
              \r\n \t
            • Alkalosis<\/strong>:\r\n
                \r\n \t
              • Due to\u00a0loss of HCl<\/strong>\u00a0during persistent vomiting.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n \r\n
                  \r\n \t
                • Metabolic acidosis<\/strong>:\r\n
                    \r\n \t
                  1. From\u00a0loss of bicarbonate<\/strong>\u00a0in diarrhea.<\/li>\r\n \t
                  2. Also occurs during malnutrition<\/strong> when cells rely on fat breakdown, producing\u00a0ketones<\/strong> (ketoacidosis).\r\n
                      \r\n \t
                    • Malnourished<\/strong>\u00a0cells cannot function properly, risking organ failure.\r\n
                        \r\n \t
                      • Cells revert to\u00a0fat<\/strong>\u00a0and\u00a0protein<\/strong>\u00a0breakdown, further increasing acidity.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t
                      • Lactic acid<\/strong>\u00a0buildup may occur if cells switch to anaerobic respiration due to insufficient oxygen or glucose.<\/li>\r\n<\/ol>\r\n<\/li>\r\n<\/ul>\r\n \r\n
                          \r\n \t
                        • Note<\/strong>:\u00a0 The kidneys<\/strong> are typically able to maintain tight control of blood pH, maintaining blood pH homeostasis<\/strong>.\r\n
                            \r\n \t
                          • Metabolic acidosis typically only occurs if nephrons aren't able to keep up with ensuring the excretion of excess H+<\/sup><\/strong> and reabsorption of bicarbonate (HCO3<\/sub>-<\/sup>)<\/strong>.<\/li>\r\n \t
                          • Likewise nephrons typically are able prevent alkalosis by ensuring the reabsorption of H+<\/sup><\/strong> and excretion of bicarbonate.<\/strong><\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\nImpact on Cell and Organ Function:<\/strong>\r\n
                              \r\n \t
                            • Incorrect pH impairs cellular enzyme activity.<\/li>\r\n<\/ul>\r\n

                              Summary<\/strong><\/h1>\r\n
                                \r\n \t
                              • GI illnesses and dehydration can produce dangerous electrolyte and pH disturbances.<\/li>\r\n \t
                              • Managing hydration and electrolytes are crucial to prevent morbidity and mortality.<\/li>\r\n<\/ul>","rendered":"

                                Digestive System and Fluid Loss<\/strong><\/p>\n

                                GI Fluid Production<\/strong><\/h1>\n
                                  \n
                                • The GI tract produces and processes large amounts of fluids daily:\n
                                    \n
                                  • Saliva: 1.5 liters.<\/li>\n
                                  • Gastric secretions (HCl, enzymes): 1.5 liters.<\/li>\n
                                  • Bile: 1 liter.<\/li>\n
                                  • Pancreatic enzymes, bicarbonate buffer: 1 liter.<\/li>\n<\/ul>\n<\/li>\n
                                  • Most of these fluids are reabsorbed in the small and large intestines, leaving about\u00a0150 mL<\/strong>\u00a0of undigested material and bacteria to be excreted.<\/li>\n<\/ul>\n

                                    Causes of Fluid and Electrolyte Imbalances<\/strong><\/h1>\n
                                      \n
                                    • Dehydration<\/strong> occurs with excessive vomiting or diarrhea:\n
                                        \n
                                      • Leads to\u00a0hypovolemia<\/strong>\u00a0(low blood volume).<\/li>\n
                                      • Results in\u00a0low blood pressure<\/strong>\u00a0and\u00a0poor tissue perfusion<\/strong>.<\/li>\n
                                      • Causes\u00a0intracellular dehydration<\/strong>, impairing cell function.<\/li>\n
                                      • Can be\u00a0fatal<\/strong>\u00a0if not managed.<\/li>\n<\/ul>\n<\/li>\n
                                      • Electrolyte loss<\/strong>:\n
                                          \n
                                        • Sodium<\/strong>\u00a0and\u00a0chloride<\/strong>\u00a0lost through vomiting (gastric HCl).<\/li>\n
                                        • Sodium and potassium<\/strong>\u00a0lost via diarrhea.<\/li>\n
                                        • Loss causes\u00a0alkalosis<\/strong>\u00a0if HCl is lost, or\u00a0acidosis<\/strong>\u00a0if bicarbonate is lost.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                                          Causes of Acid-Base Imbalances<\/strong><\/h1>\n
                                            \n
                                          • Alkalosis<\/strong>:\n
                                              \n
                                            • Due to\u00a0loss of HCl<\/strong>\u00a0during persistent vomiting.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                                               <\/p>\n

                                                \n
                                              • Metabolic acidosis<\/strong>:\n
                                                  \n
                                                1. From\u00a0loss of bicarbonate<\/strong>\u00a0in diarrhea.<\/li>\n
                                                2. Also occurs during malnutrition<\/strong> when cells rely on fat breakdown, producing\u00a0ketones<\/strong> (ketoacidosis).\n
                                                    \n
                                                  • Malnourished<\/strong>\u00a0cells cannot function properly, risking organ failure.\n
                                                      \n
                                                    • Cells revert to\u00a0fat<\/strong>\u00a0and\u00a0protein<\/strong>\u00a0breakdown, further increasing acidity.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n
                                                    • Lactic acid<\/strong>\u00a0buildup may occur if cells switch to anaerobic respiration due to insufficient oxygen or glucose.<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n

                                                       <\/p>\n

                                                        \n
                                                      • Note<\/strong>:\u00a0 The kidneys<\/strong> are typically able to maintain tight control of blood pH, maintaining blood pH homeostasis<\/strong>.\n
                                                          \n
                                                        • Metabolic acidosis typically only occurs if nephrons aren’t able to keep up with ensuring the excretion of excess H+<\/sup><\/strong> and reabsorption of bicarbonate (HCO3<\/sub>–<\/sup>)<\/strong>.<\/li>\n
                                                        • Likewise nephrons typically are able prevent alkalosis by ensuring the reabsorption of H+<\/sup><\/strong> and excretion of bicarbonate.<\/strong><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                                                          Impact on Cell and Organ Function:<\/strong><\/p>\n

                                                            \n
                                                          • Incorrect pH impairs cellular enzyme activity.<\/li>\n<\/ul>\n

                                                            Summary<\/strong><\/h1>\n
                                                              \n
                                                            • GI illnesses and dehydration can produce dangerous electrolyte and pH disturbances.<\/li>\n
                                                            • Managing hydration and electrolytes are crucial to prevent morbidity and mortality.<\/li>\n<\/ul>\n","protected":false},"author":1370,"menu_order":9,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":["zoe-soon"],"pb_section_license":"cc-by-nc-sa"},"chapter-type":[],"contributor":[60],"license":[57],"class_list":["post-5361","chapter","type-chapter","status-web-only","hentry","contributor-zoe-soon","license-cc-by-nc-sa"],"part":67,"_links":{"self":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters\/5361","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/users\/1370"}],"version-history":[{"count":3,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters\/5361\/revisions"}],"predecessor-version":[{"id":5365,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters\/5361\/revisions\/5365"}],"part":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/parts\/67"}],"metadata":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapters\/5361\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/media?parent=5361"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/pressbooks\/v2\/chapter-type?post=5361"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/contributor?post=5361"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/pathophysiology\/wp-json\/wp\/v2\/license?post=5361"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}