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| Elimination |
| | The toxicokinetic process responsible for the removal or expulsion of a substance from the body. |
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| Endocytosis |
| | The process whereby a substance is engulfed and taken into a cell by an inward folding of the cell membrane, which detaches and moves into the cytoplasm. |
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| Enterohepatic circulation |
| | Also known as enterohepatic recirculation. The cycling of a substance from the blood into the liver, then into the bile and gastrointestinal tract. This is followed by re-uptake into the blood stream from the gastrointestinal tract, possibly after chemical or enzymatic breakdown. |
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| Enzyme |
| | A protein formed in living cells that acts as a catalyst for chemical reactions in cells. |
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| Enzyme Activation |
| | The increase in levels of an enzyme as the result of stimulation by another chemical substance. Same as enzyme induction. |
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| Enzyme Inhibitor |
| | A substance which causes a decrease in levels of an enzyme. |
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| Epidermis |
| | The outer layer of the skin. Also known as epithelium. |
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| Equilibrium |
| | A state of balance. Opposing forces exactly counteract each other. |
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| Excretion |
| | A process whereby substances (or metabolites) are eliminated from the body. |
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| Exposure |
| | Contact with a foreign substance, usually by inhalation, ingestion, or skin contact. |
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| Exposure Dose |
| | The amount of a substance to which a person is subjected. |
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