Exam 4: Hazard, Exposure, and Risk Modeling

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Why is toxicokinetics and toxicodynamics the best but a very expensive approach to modeling a hazard and its risk?

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The doses or exposures can be matched to actual concentrations (toxicokinetics) in the animal, determination of target organs, and toxicity/effects (toxicodynamics) based on dose and concentration. This may give some hints as to mechanism of action and portions of organs where the damage starts and its progression to disease or death. The metabolism of the compound and the activity of the metabolites would also arise from this data.

How is carcinogenicity taken into account in risk analyses?

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A carcinogencity slope factor is incorporated to the regulatory number generated (LADD or lifetime average daily dose per unit of body weight in mg/kg/day).

What is a TWA?

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The Time-Weighted Average for inhaled compounds represents the average concentration over that time period unless some threshold toxicity is reached during that time period.

What is a QSAR? How does this apply to polychlorinated dibenzodioxins and dibenzofurans?

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What is a LOEL, LOEC, NOEL and NOEC and how are they determined?

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How is exposure determined? What is its usefulness?

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What is a hazard in risk assessment terms?

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What is the AUC?

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What is a RgD?

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