Excretory System

[idkididk]

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Children who develop acute glomerulonephritis, in which the renal glomeruli are inflamed and therefore fail to filter adequate quantities of fluid, would be expected to develop all of the following EXCEPT:

1. an excess of extracellular fluid in body tissue.
   
   
2. a high concentration of urea in the blood.
   
   
3. a decreased urine output.
   
   
4. a high concentration of sodium in the urine
   

Why is the answer D? If the renal glomeruli cannot filter adequate quantities of the fluid, I would expect the urine output to decrease (C), which would lead to A, and since sodium is reabsorbed by the body but it's not filtered correctly, then wouldn't it end up staying in the urine?

 

[jetsfan1234]

Recall what the glomerulus is. It's the little tangled ball of arteries that sits atop the nephron and filters blood, allowing solutes/water to pass into the nephron. When the glomerulus is inflamed, it decreases the rate of blood filtration. As a result, fluid builds up in the body. BUT, the fluid that manages to get through the glomerulus is filtered normally. There's no reason that the urine should have a high concentration of sodium.