The diagram illustrates a simplified dialysis machine. How do the urea concentrations in the blood and dialysis fluid alter as they move through the apparatus?
- Aurea concentration in blood decreases; urea concentration in dialysis fluid decreases
- Burea concentration in blood decreases; urea concentration in dialysis fluid increases
- Curea concentration in blood increases; urea concentration in dialysis fluid decreases
- Durea concentration in blood increases; urea concentration in dialysis fluid increases