Answer:
The glomerular filtrate
in the loop of Henie gets concentrated in the descending loop and then gets
diluted in the ascending limb. The thin wall of descending limb of Henle's loop
is permeable to water, but not to the solutes. The isotonic tubular fluid flows
down the limb.
It gradually looses
its water the by exosmosis due to increasing osmolarity of medullary interstitium
through which the limb extends.
Thus, the
filtrate becomes hypertonic to blood plasma. The ascending limb of loop of
Henie is impermeable to water, but permeable to ions like , , and
it is partially permeable to urea.
Thus, in the thick
ascending-limb of the loop of Henie, Na, K, Ca, Mg and Cl are reabsorbed, making
the filtrate hypotonic to blood plasma and diluted as compared to descending
limb.
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