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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→[[Calcium Recovery - Physiology| Calcium]]
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.
===[[Calcium Recovery - Physiology| Calcium]]===
===Calcium===
Half the plasma calcium is bound to proteins so it is only the ionised form which is available for filtration. Reabsorption of calcium occurs in the proximal tubule however the regulation of how much is reabsorbed occurs in the ascending limb of the loop of henle, the distal tubule and collecting ducts.
Half the plasma calcium is bound to proteins so it is only the ionised form which is available for filtration. Reabsorption of calcium occurs in the proximal tubule however the regulation of how much is reabsorbed occurs in the ascending limb of the loop of henle, the distal tubule and collecting ducts.