Hemoglobin catabolism results in release of iron which is transported to the bone marrow by a certain transfer protein and used again for the synthesis of hemoglobin. Specify this transfer protein:

Answer options

1. Ceruloplasmin
2. Haptoglobin
3. Transferrin (siderophilin)
4. Albumin
5. Transcobalamin

Explanation

Transferrin is a plasma protein found in the blood that carries iron compounds around the body and controls the level of free iron in biological fluids.