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  • Draw a labelled diagram showing reabsorption and secretion of major substances at different parts of the nephron

Draw a labelled diagram showing reabsorption and secretion of major substances at different parts of the nephron.

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There are three important steps involved in the formation of the urine.
These are glomerular filtration, tubular reabsorption, and urinary secretion.

Here is a diagram showing the reabsorption and secretion of major substances at different parts of the nephron.

The important points which can be inferred from the diagram above are:
- The transportation of NaCl takes place to the descending limb of the vasa recta from the ascending limb of Henle's loop.
- After reaching the descending limb of the vasa recta, NaCl is transported back to the ascending limb of the vasa recta.
- In a similar manner, urea in small amounts enters the ascending limb of the Henle's loop and by the collecting duct is sent back to the interstitium.
- The passage of water through the membrane of the collecting tubule is made easier by the presence of interstitial gradient.
- The osmolarity level rises from 300 mosmol/L in the cortex to 1200 mosmol/L in the medulla.

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