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| Target Organ |
| | An organ in which a xenobiotic exerts a toxic effect. |
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| Threshold Dose |
| | The dose at which a toxic effect is first encountered. |
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| Total Dose |
| | The sum of all individual doses, which may be received over a period of time. |
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| Toxicant |
| | An agent that produces adverse effects when absorbed into the body. |
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| Toxicokinetics |
| | The study of the time-dependent processes related to toxicants as the interact with living organism. It encompasses absorption, distribution, storage, biotransformation and elimination. |
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| Toxicology |
| | The study of the harmful interactions of chemicals on living organisms and biological systems. |
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| Toxin |
| | A specific protein produced by certain plants, animals and microorganisms that is highly toxic to other organisms (snake venom). |
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