Idrissian
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In the descending limb of the nephron of kidneys, can Na+ ions diffuse into it or is it impermeable. My text book says that sodium ions can be actively transported out the ascending limb into the medulla and then diffuse back into the descending limb, however another text book says the descending limb is impermeable to Na+ ???

I am so confused now.
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humble heroics
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Both limbs are permeable to ions, its just the ascending which is impermeable to water. I am following AQA and yes, during the process, the combination of ions entering the fluid of the medulla, water leaving descending limb and ions entering the descending limb results in the basd of the loop of Henle having the highest concentration of filtrate.

(Original post by Idrissian)In the descending limb of the nephron of kidneys, can Na+ ions diffuse into it or is it impermeable. My text book says that sodium ions can be actively transported out the ascending limb into the medulla and then diffuse back into the descending limb, however another text book says the descending limb is impermeable to Na+ ???

I am so confused now.
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