Which cells produce intrinsic factor, and what is its function?

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Multiple Choice

Which cells produce intrinsic factor, and what is its function?

Intrinsic factor is produced by the parietal cells of the stomach. Its job is to bind vitamin B12 (cobalamin) in the stomach so that this vitamin can be absorbed later in the small intestine, specifically in the terminal ileum, where the IF–B12 complex is taken up by receptors on ileal enterocytes. This binding is essential because without intrinsic factor, B12 absorption is severely impaired, leading to pernicious anemia. The other cell types have different roles: chief cells secrete pepsinogen for protein digestion, enteroendocrine cells release hormones like gastrin, and mucous cells protect the stomach lining with mucus.

Intrinsic factor is produced by the parietal cells of the stomach. Its job is to bind vitamin B12 (cobalamin) in the stomach so that this vitamin can be absorbed later in the small intestine, specifically in the terminal ileum, where the IF–B12 complex is taken up by receptors on ileal enterocytes. This binding is essential because without intrinsic factor, B12 absorption is severely impaired, leading to pernicious anemia. The other cell types have different roles: chief cells secrete pepsinogen for protein digestion, enteroendocrine cells release hormones like gastrin, and mucous cells protect the stomach lining with mucus.

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