Excretory Products And Their Elimination Ques 18
18. Which of the following factors is responsible for the formation of concentrated urine ?
[2019]
(a) Low levels of antidiuretic hormone.
(b) Maintaining hyperosmolarity towards inner medullary interstitium in the kidneys.
(c) Secretion of erythropoietin by juxtaglomerular complex.
(d) Hydrostatic pressure during glomerular filtration.
Show Answer
Answer : b
Hints & Solutions
(b) Loop of Henle along with vasa rectae plays an important role in the concentration of urine. The proximity between loop of Henle and vasa recta as well as counter current in them help in maintaining an increasing osmolarity towards the inner medullary interstitium. This mechanism helps to maintain a concentration gradient in medullary interstitium so human urine is nearly four times concentrated than initial filtrate formed. The urine concentrating mechanism plays a fundamental role in regulating water and sodium excretion.
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