C.9.1

=Explain that different metal ions fulfill different roles in the body due to their different chemical properties=

Metal ions vary on the charge densities, the ability of the ion to show variable oxidation states, and the ability of the ion to form complexes with ligands.

Important ions: Fe2+ in Hemoglobin, Ca 2+ for strong bones and teeth

Roles in the Body:
-Sodium and Potassium are vital the the functioning of and muscles. (as explained in C.9.2) -Calcium for muscular activity -Calcium and phosphorus for bone formation -Iron in Hemoglobin carries oxygen around the body. -Iron and Copper in electron transport

Chemical Properties
The role of metal ions in the body depend on their chemical properties, in particular the charge on the ion and its size (ionic radius). The most active ions and will move across cell membranes like those in nerve cells faster. These ions have a small charge and a large radius.

The ions that are most likely to be part of a molecule like hemoglobin or cytochrome oxidase will have a greater charge so they can for strong coordinate bonds.