The Renal Threshold of a Substance Refers to

Multiple Choice

The renal threshold of a substance refers to

A) the number of protein transporters for the substance per tubule.
B) the plasma concentration of the substance below which it does not appear in the urine.
C) the concentration of the substance found in the kidney before the substance becomes toxic.
D) the concentration of the substance in the urine that results in an overall increase in urine volume.