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Excretory Products and their Elimination — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYExcretory Products and their Elimination5 Marks
Question
How does tubular secretion help in maintaining ionic and acid-base balance in body fluids?
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Answer

During urine formation, the tubular cells secrete substances like H+, K+ and ammonia into the filtrate. Tubular secretion is also an important step in urine formation as it helps in the maintenance of ionic and acid base balance of body fluids.
  • PCT helps to maintain the pH and ionic balance of the body fluids by selective secretion of hydrogen ions, ammonia and potassium ions into the filtrate.
  • DCT is also capable of selective secretion of hydrogen and potassium ions and NH3 to maintain the pH and sodium-potassium balance in blood.
  • Collecting duct also plays a role in the maintenance of pH and ionic balance of blood by the selective secretion of H+ and K+ .

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