In what way do the concentrations of oxygen and urea in the renal artery differ from their concentrations in the renal vein?
- Aoxygen in renal artery: higher; urea in renal artery: higher
- Boxygen in renal artery: higher; urea in renal artery: lower
- Coxygen in renal artery: lower; urea in renal artery: higher
- Doxygen in renal artery: lower; urea in renal artery: lower