The kidney's ability to concentrate urine depends on the maintenance of an osmolarity gradient between the interstitial fluid of two structures: the cortex and the medulla. 2. this osmolarity gradient is maintained by both the passive transport and the active transport of filtrate. 3. the osmolarity gradient is also maintained by the passive transport of . 4. water responds to the osmolarity gradient by moving from an area of lower solute concentration to an area of higher solute concentration--a process called . 5. osmosis does not require energy. for this reason, osmosis is a form of . 6. the loss of water from the results in urine t
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