The presence of large quantities of unabsorbed solutes in the renal tubule causes an increase in urine volume this is called: (A) Osmotic diuresis, (B) Osmotic natriuresis, (C) Water intoxication, (D) Water diuresis
Answer is A. Diuresis due to a high concentration of osmotically active substances in the renal tubules (for example, urea, sodium sulfate), which limit the reabsorption of water.Ref: Ganong&;s review of medical physiology; 24th edition; page no; 689