<prompt> A major fraction of filtered potassium is absorbed in:Collecting ductDistal convoluted tubuleProximal convoluted tubuleThick ascending limb of loop of Henle  <response>: Potassium is filtered at the glomerulus, reabsorbed secreted by tubules, and is excreted in urine. Of the total K ingested in the diet, 90-95 is excreted. PCT :reabsorbs about 67 of the filtered K under most conditions; 20 of the filtered K is reabsorbed by the LOH. The two most impoant physiologic regulators of K secretion Plasma Aldosterone. Other factors include a Flow rate of the tubular fluid, acid-base balance, glucocoicoids. 