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Reabsorption and Secretion Along the Proximal Tubule - Anatomy & Physiology (view source)
Revision as of 16:38, 3 September 2008
, 16:38, 3 September 2008→[[Renal Handling of Urea - Physiology| Urea]]
* No potassium excretion occurs here due to the lack of potassium ion channels in the apical membrane
* No potassium excretion occurs here due to the lack of potassium ion channels in the apical membrane
===[[Renal Handling of Urea - Physiology| Urea]]===
===Urea===
50% of filtered urea is reabsorbed in the proximal tubule. However the concentration of urea actually increases thanks to the reabsorption of 70% of the filtered water in the same portion of the nephron. Urea is not able to be reabsorbed from this point until it reaches the lower portion of the collecting duct therefore its concentration further increases with the reabsorption of water.
50% of filtered urea is reabsorbed in the proximal tubule. However the concentration of urea actually increases thanks to the reabsorption of 70% of the filtered water in the same portion of the nephron. Urea is not able to be reabsorbed from this point until it reaches the lower portion of the collecting duct therefore its concentration further increases with the reabsorption of water.