NEET Biology question

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

(A)Hydrostatic pressure during glomerular filtration
(B)Low levels of antidiuretic hormone
(C)Maintaining hyperosmolarity towards the medullary interstitium in the kidneysCorrect
(D)Secretion of erythropoietin by the Juxtaglomerular complex

Answer: (C)

Solution

Concentrated urine formation depends on the counter-current mechanism of the loop of Henle and vasa recta maintaining an increasing hyperosmolarity toward the inner medullary interstitium (about 300 mOsm/L in the cortex rising to about 1200 mOsm/L in the inner medulla), which draws water out of the

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Question ID VK-116833