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Preceding page blank xi,i <br /> LIST OF FIGURES <br /> 2-1 Levels of Significant Exposure to Lead - Inhalation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 <br /> 2-2 Levels of Significant Exposure to Lead - Oral . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 <br /> 2-3 Lead Metabolism Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 <br /> 2-4 A Compartmental Model for Lead Biokinetics with Multiple Pool for Blood Lead . . . . . . . . . . 102 <br /> 2-5 Curvilinear Relationship of Serum Lead to Blood Lead . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 <br /> t <br /> 2-6 Effects of Lead on Heme Biosynthesis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 <br /> 2-7 Multiorgan Impact of Reduction of Heme Body Pool by Lead . . . . . . . . . . . . . . . . . . . . . . 117 <br /> i <br /> 2-8 Dose-Response Curve for Erythrocyte Protoporphyrin (EP) as a Function of Blood Level in <br /> Subpopulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133 <br /> 2-9 Existing Information on Health Effects of Lead . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146 <br /> 5-1 Frequency of NPL Sites with Lead Contamination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182 <br /> a <br /> 5 <br /> a <br />