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What is the electric charge on the iron ion?
2+ or 3+, as in Fe2+ or Fe3+
Iron's physiological role
Oxygen (O2) and carbon dioxide (CO2) transport. Hemoglobin in red blood cells, and myoglobin in muscle cells are the iron-containing proteins that transport these gases.
Sources of iron
Meats (they are red because they contain hemoglobin and myoglobin). Chlorophyll the green pigment in plants also has iron, but it has very poor bioavailability (=not absorbed well)
What is the electric charge on the zinc iron?
2+ as in Zn2+
Zinc's physiological role
Cofactor for many enzymes.
Sources of zinc
Meats, whole grains (not refined grains!), enriched fruit juices