Statement I : The final reabsorption of water from the urine into the blood occurs through the colle

Question

Statement I : 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 II: The loop of Henle creates a sodium gradient in the interstitial fluid.\

Professor PC Thomas Classes · Answer

(a) : The counter current mechanism in loop of Henle and vasa recta, helps in maintaining an increasing osmolarity of the interstitial fluid i.e., from $300 \mathrm{mOsmolL}{ }^{-1}$ in the cortex to about $1200 \mathrm{mOsmolL}{ }^{-1}$ in the inner medulla. This gradient is mainly caused by NaCl and urea. This gradient thus helps in easy reabsorption of water from the filtrate in the collecting duct so as to produce hyperosmotic urine.