Which of These Statements Describes the Renal Threshold

Multiple Choice

Which of these statements describes the renal threshold

A) It is the maximum amount of a particular substance that can be excreted in the urine per unit of time.
B) It is the maximum amount of a particular substance that the tubular cells are capable of actively reabsorbing per unit of time.
C) It is the plasma concentration of a particular substance at which its Tm is reached and the substance first appears in the urine.
D) It is the maximum amount of waste product that can be concentrated in the urine per unit of time.