NEET-XII-Biology
P1 year:2019
- #132Which 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.
(3) Secretion of erythropoietin by
Juxtaglomerular complex
(4) Hydrostatic pressure during glomerular
filtrationdigAnsr: 2Ans : (2)
Sol. The proximity between loop of henle and vasa
recta as well as counter current in them help
in maintaining an increasing osmolalrity
towards the inner medullary interstitium. This
mechanism help to maintain a concentration
gradient in medullary interstitium so human
urine is nearly four times concentrated than
initial filtrate formed.