If the concentration of glucose in the blood flowing through the kidneys is with

Question

If the concentration of glucose in the blood flowing through the kidneys is within normal range, which of the following statements is correct?

A) No glucose passes from the glomerulus to the Bowman's capsule. B) The Bowman's capsule secretes glucose back into the blood. C) Most glucose within the nephron tubule is reabsorbed by the blood. D) Most glucose that passes from the blood into the nephron tubule remains in the urine and is excreted. E) The nephron pumps glucose into the collecting duct.

Explanation / Answer

C) Most glucose within the nephron tubule is reabsorbed by the blood.

Glucose is a pretty small molecule so it easily goes through the filter of the glomerulus to bowman's capsule (through holes in endothelial cells). Since glucose is extremely important to the body, there are special transporters in the proximal tubule of the nephron that reabsorb all the glucose from the (potential) urine back into the blood. When you have hyperglycemia (or too much glucose in the blood) then those transporters are working overtime but they can't get all the glucose back because there's just so much. So, you end up getting glucose in the urine.

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