NEET 2019 Biology question

Which of the following factors is responsible for the formation of concentrated urine?

(1)Low levels of antidiuretic hormone
(2)Maintaining hyperosmolarity towards inner medullary interstitium in the kidneys.Correct
(3)Secretion of erythropoietin by Juxtaglomerular complex
(4)Hydrostatic pressure during glomerular filtration

Answer: (2)

Solution

The proximity of the loop of Henle and the vasa recta, and the counter-current flow of filtrate and blood in them, maintain an increasing osmolarity from the cortex (about 300 mOsm/L) to the inner medullary interstitium (about 1200 mOsm/L). This gradient allows water to be reabsorbed from the

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Question ID VK-092506