Review Table 20.18, which lists some important biological functions associated with different first-row transition metals. The transport of O₂ in the blood is carried out by hemoglobin. Briefly explain how hemoglobin transports O₂ in the blood.

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TABLE 20.18 The First-Row Transition Metals and Their Biological Significance First-Row Transition Metal Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Biological Function(s) None known. None known. None known in humans. Assists insulin in the control of blood sugar; may also be involved in the control of cholesterol. Necessary for a number of enzymatic reactions. Component of hemoglobin and myoglobin; involved in the electron-transport chain. Component of vitamin B₁2, which is essential for the metabolism of carbohydrates, fats, and proteins. Component of the enzymes urease and hydrogenase. Component of several enzymes; assists in iron storage; involved in the production of color pigments of hair, skin, and eyes. Component of insulin and many enzymes.