Pernicious anemia is caused by a deficiency of intrinsic factor, which is secreted by

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Pernicious anemia is caused by a deficiency of intrinsic factor, which is secreted by parietal cells of the stomach. Intrinsic factor is necessary for the absorption of vitamin B₁₂ Normally, vitamin B₁₂ is transported across the intestinal mucosa by intrinsic factor. Insulin is secreted by beta cells of the pancreas. Bile is secreted by the gallbladder. Adrenalin is secreted by the adrenal glands.

Pernicious Anemia Is Caused by a Deficiency of Intrinsic Factor