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Countercurrent system Sands JM; Kokko JPKidney Int 1990[Oct]; 38 (4): 695-9Urinary concentration is achieved by countercurrent multiplication in the inner medulla. The single effect in the outer medulla is active NaCl absorption from the thick ascending limb. While the single effect in the inner medulla is not definitively established, the majority of experimental data favors passive NaCl absorption from the thin ascending limb. Continued experimental studies in inner medullary nephron segments will be needed to elucidate fully the process of urinary concentration.|Animals[MESH]|Countercurrent Distribution[MESH]|Humans[MESH]|Kidney Concentrating Ability/*physiology[MESH]|Kidney Tubules/*physiology[MESH]|Models, Biological[MESH]|Sodium Chloride/pharmacokinetics[MESH]|Urea/metabolism[MESH]|Water-Electrolyte Balance/*physiology[MESH] |
