In iron metabolism:
- A. Iron stored in liver cells is transported across
cell membranes in the ferrous state.
- B. The major plasma transport protein for iron is hemosiderin.
- C. In the form of ferritin, iron may accumulate in
mucosal cells of the duodenum.
- D. Nearly all iron in the diet is absorbed and
any excess secreted in the feces.
A, B and C
- A and C
B and D
All of the above
- A. It is stored in the iron (III) state, and
must be reduced to the iron (II) state prior to transport.
- B. Transferrin is the major iron transport protein.
- C. Ferritin is an intracellular iron binding (storage) protein.
- D. Excess is certainly excreted,
but it is never absorbed by the body.
Uptake by the intestinal mucosal cells occurs,
but in the iron-replete state these iron-rich cells slough.
The iron does appear in the feces.
Go to the next question