Urine Formation in the Nephron · NCERT Biology

Tubular secretion helps in the maintenance of ionic and acid-base balance of body fluids by secreting which ions into the filtrate?

  1. Na+ and Cl-
  2. H+, K+ and ammonia
  3. Glucose and amino acids
  4. Ca2+ and Mg2+
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Correct answer: H+, K+ and ammonia

During urine formation, tubular cells secrete substances like H+, K+, and ammonia into the filtrate. This is a crucial step in maintaining the pH and ionic balance of the blood.

Difficulty: Medium Question 9 of 20

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