Receptor for absorption of Vit-B12 intrinsic factor complex is located in: (A) Ileum, (B) Duodenum, (C) Transverse colon, (D) Descending colon
Answer is A. For the absorption of Vit B12, it has to form a complex with Intrinsic factor. This complex has a receptor on the epithelial cell surface of ileum. Once attached, the complex is absorbed.