Talk:Thick ascending limb of loop of Henle

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where is the loop of Henle? The loop of Henle is a portion of the nephron between the proximal and distal convoluted tubules that is found in the medulla of the kidney

[edit] Water Osmosis

If the TAL is impermeable to water, then what is the meaning of this paragraph:

"Urea which remains in the loop creates a solute potential that prevents water completely osmosing out into the interstitial space. This means that while almost all the ions are reabsorbed, there will still be some water in the urine, and hence, the concentration of the filtrate in the loop is decreased here. (If only ions were present, and a certain amount of ions were reabsorbed, one would expect the same amount of the water to be reabsorbed too, and hence the concentration would remain the same, but this is not true.)" ?

What is the role of Urea here? Horia (talk) 20:10, 25 February 2008 (UTC)