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Urine is concentrated a) in the ureters. b) by active secretion in the loop of Henle....

Urine is concentrated a) in the ureters. b) by active secretion in the loop of Henle. c) by facilitated diffu sion in the collecting ducts. d) by reabsorption in the proximal tubule.

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Urine is concentrated byc) facilitated diffusion in the collecting ducts.

The collecting duct concentrates it by water reabsorption through facilitated diffusion when ADH is present.The permeability of the collecting ducts for water leads to a concentration of the urine up to the fivefold osmolarity of the plasma.The permeability of the collecting ducts is regulated with ADH.

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