Urine Formation: Tubular Secretion -
- It is a process in which the renal tubules excrete additional waste from the bloodstream into the filtrate.
- It occurs as follows:
- In PCT: Creatinine, hippuric acid, pigments, drugs, hydrogen ions and ammonia are actively secreted into the filtrate from the interstitial fluid.
- In Loop of Henle: The thick segment of the ascending loop of Henle secretes urea.
- In DCT: Potassium, hydrogen ions, ammonia, bicarbonate ions are secreted into the filtrate here.
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The thick segment of the ascending loop of Henle secretes urea. Hence, the correct option is urea
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