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Renal System O1
Clearance and transport
| Question | Answer |
|---|---|
| Define clearance | Volume of plasma cleared of a substance per unit time |
| If substance X is filtered and completely reabsorbed, what is the clearance of X? | Zero |
| Criteria for the clearance of a substance to be an indicator of GFR | Freely filtered, not reabsorbed or secreted, not metabolized or produced |
| For inulin, the clearance is equal to the | GFR |
| For PAH, the clearance is equal to the | Renal plasma flow |
| If clearance<GFR, there has been net | Reabsorption |
| If clearance=GFR, there has been | No net reabsorption or secretion |
| If clearance>GFR, there has been net | Secretion |
| Creatinine clearance is mostly _____ of urine flow | Independent |
| As GFR decreases, creatinine clearance | Decreases |
| Normal plasma value of creatinine | 1 mg/dl |
| Renal urea absorption is ____ on urine flow | Dependent |
| In volume depletion, the BUN:Cr ratio | Increases |