Medullary interstitial hypersomolarity

Is essential for urinary concentration

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Is essential for maintenance of blood osmomolarity

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Is maintained chiefly by sodium chloride and urea

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All of above are true

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Solution

The correct option is A Is essential for urinary concentration
There is high concentration of sodium and urea in the renal medullary interstitium which is critically essential for concentration of urine. These create a high osmotic gradient between the renal tubular lumen and interstitium, because this is necessary for water absorption.
So, the correct answer is A.

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