| In some simple organisms, such as amoeba, water is actively excreted from the cell in vacuoles. |
| After a medication is metabolized, many medication metabolites are excreted in the urine. |
| Chromatography of organic acids evidences the excreted fumaric acid, often associated with succinic acid and alphacetoglutaric acid. |
| Only small amounts are excreted unchanged in the urine. A genetic pseudocholinesterase deficiency could lead to increased cocaine levels. |
| Creatinine is excreted in proportion to muscle mass, and its concentration remains relatively constant on a daily basis. |
| Because creatine is excreted as creatinine by the kidneys, it is prudent to take it with plenty of water. |
