Question

why does the kidneys reabsorb urea into the blood even though it is a waste product?

why does the kidneys reabsorb urea into the blood even though it is a waste product?

Homework Answers

Answer #1

Answer

  • Urea is a nitrogenous water product produce in liver during catabolism of proteins into amino acids.
  • Urea is filtered through the filtration membrane into the Bowman's capsule.
  • The urea is reabsorbed at two regions in the nephron tubule :

    1) Proximal convoluted tubule : About 50% of urea is passively reabsorbed here.
    2) Collecting duct : It is the terminal region of nephron that has high permeability to urea.
  • Urea reabsorption, increases its concentration in the inner medullary region.
  • This creates an osmotic gradient.
  • More water follows this osmotic gradient and is reabsorbed from loop of Henle (descending limb that is permeable to water).
  • Hence, urea reabsorption occurs to facilitate water reabsorption and formation of concentrated urine.
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