Contents: Introduction, Transport and Storage of Metal Ions, Elements in Biology and Medicine, The Role of Biological Macromolecules and Polymers, Energy in Biological Systems and Hydrogen Biochemistry, The Functional Value of the Chemical Elements in Biological Systems, Sodium, Potassium and Chlorine, The Biological Chemistry of Magnesium, Calcium, Zinc, Nonheam Iron: Redox Reactions and Controls, Heam Iron: Coupled Redox Reactions, Manganese, Copper, Nickel and Cobalt, Molybdenum, Vanadium and Tungsten, Phosphate, Silica and Chloride: Acid-base Non-metals, Sulphur, Selenium and Halogens: Redox non-metals.