The Renal Threshold Is the

The renal threshold is the

A) maximum amount of a particular substance that can be excreted in the urine per unit of time
B) maximum amount of a particular substance that the tubular cells are capable of actively reabsorbing per unit of time
C) plasma concentration of a particular substance at which its T_m is reached and the substance first appears in the urine
D) maximum amount of waste products that can be concentrated in the urine per unit of time
E) maximum amount of water that can be osmotically absorbed across the tubules per unit of time