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Unformatted text preview: ; as hydrogen ions are transported into & out of cells, potassium ions are transported in the opposite direction o cortical collecting ducts predictably excrete ~ 15% of potassium ions in filtrate (~ 85% reabsorbed from tubules & loop of Henle) o when ECF potassium concentration is low, excretion of potassium can be reduced, & some collecting duct cells can reabsorb some potassium o in the presence of aldosterone , f or each sodium reabsorbed, a potassium ion is secreted to maintain electrolyte balance- Regulation of other ions: o Calcium & phosphate ion levels are regulated by the interaction of parathyroid hormone & calcitonin o Chloride ion reabsorption is ordinarily coupled to sodium ion reabsorption & transport (ordinarily nearly all chloride ions reabsorbed) page3...
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- Fall '10
- Anthropology, Sodium, Ion, potassium ions