The book provides a comprehensive treatise of the molecular structure, physiological function and the evolution of oxygen carriers, found in circulating body fluids, animal, and plant tissues. It includes 15 chapters: 1) Oxygen Carriers as Molecular Models of Allosteric Behavior. 2) Plant Hemoglobins. 3) Functions of Cytoplasmic Hemoglobins and Myohemerythrin. 4) Structures of Red Blood Cell Hemoglobins. 5) Respiratory Function of the Red Blood Cell Hemoglobins of Six Animal Phyla. 6) Molecular Structure/Function Relationships of Hemerythrins. 7) Physiological Function of the Hemerythrins. 8)...