NEET Biology question
Read the given statements and select the correct option. Statement 1: The final reabsorption of water from the urine into the blood occurs through the collecting duct of a mammalian nephron, resulting in the production of hyperosmotic urine. Statement 2: The loop of Henle creates a sodium gradient in the interstitial fluid.
Answer: (A)
Solution
The counter-current mechanism of the loop of Henle and vasa recta raises the interstitial osmolarity from about 300 mOsm/L in the cortex to about 1200 mOsm/L in the inner medulla, a gradient built mainly from NaCl and urea; this gradient allows water to be
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