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Reabsorption and Secretion Along the Distal Tubule and Collecting Duct - Anatomy & Physiology (view source)
Revision as of 16:57, 3 September 2008
, 16:57, 3 September 2008→Ions and Compounds
* [[Aldosterone]]
* [[Aldosterone]]
* [[Atrial Natriuretic Peptide]]
* [[Atrial Natriuretic Peptide]]
===Potassium===
====[[Distal Tubule - Anatomy & Physiology| Distal Tubule]]====
* Here the potassium and chloride symporter actually excretes the two ions into the lumen of the tubule
* Na<sup>+</sup> / K<sup>+</sup> ATPases in the basolateral membrane move potassium into epithelial cells from the intercellular spaces in order to remove sodium. The potassium then diffuses into the lumen via channels
* The ability to secrete potassium here is vital in animals with high potassium diets such as herbivores where excreting only the amount filtered would not be suffice
====[[Collecting Duct - Anatomy & Physiology #Principal Cells| Principal Cells of Collecting Duct]]====
* Potassium transported into lumen
* Is both absorbed and secreted via paracellular route
* Na<sup>+</sup> / K<sup>+</sup> ATPases in the basolateral membrane move potassium into epithelial cells from the intercellular spaces in order to remove sodium and keep potassium concentrations high.
** Aldosterone works here
====[[Collecting Duct - Anatomy & Physiology #Intercalated cells| Intercalated Cells of Collecting Duct]]====
* Potassium is absorbed here in exchange for hydrogen