Vit. B12 is absorbed in the: (A) Stomach, (B) Duodenum, (C) Lower jejunum, (D) Terminal ileum
Answer is D. One molecule of IF can combine with 2 molecules of B12. This IF-B12 complex is attached with specific receptors on mucosal cells. The whole IF-B12 complex is internalized . It may be noted that B12 is absorbed from the ileum. Ref: DM Vasudevan, page no: 404