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

Answers (1)

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 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 vasa recta from the ascending limb of Henle's loop.
- After reaching the descending limb of vasa recta, NaCl is transported back to the ascending limb of vasa recta.
- In a similar manner, urea in small amounts enter 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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