Intrinsic factor A) increases gastric motility. B) causes the release of stomach acid. C) facilitates the absorption of vitamin B₁₂. D) protects the stomach lining from the effects of stomach acid. E) stimulates the synthesis of DNA.

Question

Quizplus · Accepted Answer

Intrinsic factor is a glycoprotein produced by the parietal cells of the stomach. It is essential for the absorption of vitamin B12 in the small intestine. Vitamin B12 is crucial for the synthesis of DNA, among other functions, but the direct role of intrinsic factor is to bind to vitamin B12 and facilitate its absorption, not to stimulate DNA synthesis itself.

Intrinsic Factor