Q. Which of the following factors is responsible for the formation of concentrated urine?
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.
Explanation
[Solution] The countercurrent mechanism maintains an increasing osmolarity towards the inner medulla, allowing concentrated urine. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.