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NEETZoologyExcretory Products and their Elimination

How does DCT maintain the pH and sodium-potassium balance in blood?

Options

  1. ABy reabsorbing essential nutrients
  2. BBy reabsorbing HCO₃⁻ and secreting hydrogen and potassium ions and NH₃
  3. CBy maintaining osmolarity of medullary interstitial fluid
  4. DBy concentrating filtrate as it moves down

Correct answer

B. By reabsorbing HCO₃⁻ and secreting hydrogen and potassium ions and NH₃

Step-by-step solution

Distal Convoluted Tubule (DCT): Conditional reabsorption of Na+ and water takes place in this segment. DCT is also capable of reabsorption of HCO3– and selective secretion of hydrogen and potassium ions and NH3 to maintain the pH and sodium-potassium balance in blood. Collecting Duct: This long duct extends from the cortex of the kidney to the inner parts of the medulla. Large amounts of water could be reabsorbed from this region to produce a concentrated urine. This segment allows passage of small amounts of urea

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