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| Detoxification |
| | A metabolic process whereby a parent substance is changed to a daughter product (metabolite) that has lessened toxicity. |
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| Diffusion |
| | The spontaneous movement of a substance from a high concentration gradient to a lower concentration gradient. |
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| Disposition |
| | The term used to describe the kinetics of a substance in the body. It encompasses absorption, distribution, metabolism, and elimination of a chemical. |
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| Distal |
| | Away from a point of reference. As used in medicine, something distal is farther away from the main body. For example, the foot is distal to the knee. |
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| Distribution |
| | Movement of a substance from the portal of entry to other areas of the body. |
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| DNA |
| | Deoxyribonucleic acid. The very large molecules in the nucleus of all living cells. It carries the genetic code. |
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| Dose |
| | The amount of a substance received at one time. Dose is usually expressed as administered or absorbed dose (e.g., milligrams material/kilogram of body weight). |
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