The "mucosal block" theory is one explanation of how the body protects itself from excess absorption of dietary

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The mucosal block theory suggests that the body protects itself from excess absorption of dietary iron and zinc by blocking their absorption in the small intestine. This is achieved through the production of mucin, a glycoprotein that lines the intestinal wall and binds to iron and zinc to prevent their absorption into the bloodstream.

The "Mucosal Block" Theory Is One Explanation of How the Body