Over half of the potassium that appears in the urine of a patient, who has ingested some potassium salts, is derived From?
Glomerular filtrate
Secretion by the distal tubule
Reabsorption in the proximal tubule
Secretion by the loop of Henle
Secretion by the distal tubule.With a normal potassium intake filtered K+ (which is not reabsorbed) accounts for two third and secreted K+ counts for one-third of the excreted urinary K+.However, on high potassium diet, the K+ secretion increases and K+ secretion account for about 60-65% excreted K+.K+ secretion occurs in distal tubules and collecting duct.