Tooth enamel (hardest substance in human body) starts corroding if the pH becomes lower than 5.5 in mouth but mucus(in stomach) can tolerate HCl of pH value 1.4.How?
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HCL is an acid..........
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HCl in the lumen doesnt digest the mucosa because goblet cells in the mucosa secrete large quantities of protective mucus that line the mucosal surface. Basic electrolytes, such as HCO3-, trapped inside the layer of mucus neutralize any HCl that penetrates the mucus.
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