Mucosal tranfer of iron in GIT by-
**Core Concept**
Iron absorption from the gastrointestinal tract is a complex process involving both non-heme and heme iron. The mucosal transfer of iron is a crucial step in this process, where iron is transported across the enterocytes and then into the bloodstream.
**Why the Correct Answer is Right**
The correct answer is D. Divalent Metal Transporter 1 (DMT1). DMT1 is a transmembrane protein responsible for the uptake of non-heme iron in the apical membrane of enterocytes. It plays a crucial role in the mucosal transfer of iron by facilitating the transport of iron across the enterocyte membrane. DMT1 has a high affinity for ferrous iron, which is the reduced form of iron that is more easily absorbed.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a protein or mechanism involved in the mucosal transfer of iron. While it may be a related term, it is not a correct answer.
**Option B:** This option is incorrect because it is not directly involved in the mucosal transfer of iron. While it may be involved in iron metabolism, it is not the correct answer for this specific question.
**Clinical Pearl / High-Yield Fact**
Remember that DMT1 is not only responsible for iron absorption but also for the uptake of other divalent metals, such as copper and manganese. This is an important consideration in patients with metal toxicity or deficiency.
**Correct Answer:** D. Divalent Metal Transporter 1.