At the renal plasma threshold
A)more glucose is in the filtrate than active transport can handle.
B)blood volume is so great that nephrons cannot keep up.
C)the urine has too little glucose.
D)more glucose is in the blood, limiting the amount of glucose that can be reabsorbed.

Question

Quizplus · Accepted Answer

The renal plasma threshold is the plasma glucose concentration at which the kidneys start to excrete glucose into the urine. At this threshold, the amount of glucose in the filtrate exceeds the capacity of active transport to reabsorb it all, resulting in glucose being excreted in the urine. Therefore, choice A is the best answer. Choice B is incorrect because blood volume is not directly related to the renal plasma threshold. Choice C is incorrect because the amount of glucose in the urine would actually be increased at the renal plasma threshold. Choice D is incorrect because the amount of glucose in the blood would not limit the reabsorption of glucose in the renal tubules.

At the Renal Plasma Threshold