The human kidney concentrates urine in the nephrons and collecting ducts of the kidney. The nephron and collecting duct lie within interstitial fluid with a concentration gradient. The filtrate enters the nephron with an osmolarity of about 300. As the filtrate moves from A. to B. water diffuses out of the nephron and into the interstitial fluid. What would be the approximate osmolarity of the filtrate at point B.
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The human kidney concentrates urine in the nephrons and collecting ducts of the kidney. The nephron...
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