Physiology – MCQ 68 – Urinary concentrating ability of kidney

Urinary concentrating ability of the kidney is increased by:
A. ECF volume contraction
B. Increase in Renal blood flow
C. Reduction of medullary hyperosmolarity
D. Increase in GFR

Correct answer : A. ECF volume contraction

When there is ECF volume contraction, there is increased release of ADH from posterior pituitary. This stimulates the kidneys to reabsorb more water thereby producing concentrated urine.

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