Over half of the potassium that appears in the urine of a patient, who has ingested some potassium salts, is derived from

In Normal K+ intake - -        The proportion of K+ by filtration in urine- 2/3 -        The proportion of K+ by secretion in urine (Distal tubules and collecting duct)- 1/3 In High K+ intake-   -        The proportion of K+ by filtration in urine- 1/3 -        The proportion of K+ by secretion in urine (Distal tubules and collecting duct)- 2/3