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 $\mathrm{H}^{+}, \mathrm{K}^{+}$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 $\mathrm{NH}_3$ 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 $\mathrm{H}^{+}$and $\mathrm{K}^{+}$.
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