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Question
Draw a labelled diagram showing reabsorption and secretion of major substances at different parts of the nephron
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Solution
ProximalConvoluted Tubule (PCT):
ProximalConvoluted Tubule (PCT):
- Reabsorption: Almost all essential nutrients, \(70\) - \(80\%\) of electrolytes, bicarbonates, and water.
- Secretion: Hydrogen ions, ammonia, and potassium ions.
Henle’s Loop:
Henle’s Loop:
- Reabsorption of water is minimum in ascending limb and from descending limb, only water is reabsorbed.
- Ascending limb removes electrolytes.
Distal Convoluted Tubule (DCT):
Distal Convoluted Tubule (DCT):
- Conditional reabsorption of sodium ions and water.
- Secretion of Hydrogen ions, ammonia, and potassium ions, and absorption of bicarbonates.
Collecting Duct:
CollectingDuct:
- Large amounts of water are reabsorbed.
- Selective secretion of \(H^+\)and \(K^+\) ions.
Diagram of reabsorption and secretion in nephron:
ProximalConvoluted Tubule (PCT):
- Reabsorption: Almost all essential nutrients, \(70\) - \(80\%\) of electrolytes, bicarbonates, and water.
- Secretion: Hydrogen ions, ammonia, and potassium ions.
Henle’s Loop:
- Reabsorption of water is minimum in ascending limb and from descending limb, only water is reabsorbed.
- Ascending limb removes electrolytes.
Distal Convoluted Tubule (DCT):
- Conditional reabsorption of sodium ions and water.
- Secretion of Hydrogen ions, ammonia, and potassium ions, and absorption of bicarbonates.
CollectingDuct:
- Large amounts of water are reabsorbed.
- Selective secretion of \(H^+\)and \(K^+\) ions.
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