If your iron is low, eating a diet that is high in iron-rich foods such as fortified cereals, red meat, dried fruit, and beans may not be enough to give you what you need. Your doctor might recommend that you take an iron supplement.
selective. 1  having the function or power of selecting; making a selection. 2  characterized by selection, especially fastidious selection. 3  of or relating to selection. 4  Electricity, Radio. having good selectivity.
Selective permeability. Definition. noun. A feature and a function of the plasma membrane that is essential to maintain homeostasis by regulating the passage of some substances while preventing others from entering the cell.upplement. The plasma membrane is capable of being selectively permeable because of its structure, which is composed of a bilayer of hydrophobic phospholipids, and proteins that act as transporters or channels for certain molecules (e.g. ions).