Q. With reference to the functioning of the human kidney, consider the following statements:
1.Once the nitrogenous waste is removed, the filtered (cleaner) blood is returned to the systemic circulation via the renal artery.
2.In the nephron, essential substances like glucose are reabsorbed from the filtrate in the tubules and returned to the blood.
Which of the statements given above is/are correct?

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: B
Notes:

Explanation:

  • Statement 1 is incorrect: The renal artery brings unclean blood to the kidney. Filtered, cleaner blood leaves the kidney through the Renal Vein.
  • Statement 2 is correct: Selective reabsorption occurs in the Proximal Convoluted Tubule (PCT), where 100% of glucose is typically reabsorbed back into the peritubular capillaries.
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