Question

Assertion : Vasa recta is absent or highly reduced in cortical nephrons
Reason : Cortical nephrons are mainly concerned with concentration of urine

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (C)

Cortical nephrons lie in the renal cortex. They have short loop of Henle and no vasa recta. Hence, they are not involved in concentration of urine. They control plasma volume when water supply is normal