| Criteria | Marks |
|---|
| • Describes a process occurring in dialysis<br>• Relates how the identified process compensates for loss of a function of the kidneys | 3 |
| • Outlines process(es) in dialysis<br>• Relates a process to loss of a function of the kidneys | 2 |
| • Provides some relevant information | 1 |
Sample answer:
Loss of kidney function may result in a failure to remove urea from blood. In dialysis, blood from the patient passes through selectively permeable dialysis tubing. Because the urea diffuses from the high concentrations in the blood to the low concentrations in the dialysate, the urea is removed from the blood.