Besides filtration and reabsorption, the nephron removes drugs, poisons and hydrogen ions from the blood into the tubule fluid by
Correct answer: B. tubular secretion
- A. osmosis
- B. tubular secretion
- C. ultrafiltration
- D. diffusion through the ureter
Explanation
Tubular secretion actively transports selected substances from peritubular capillaries into the tubule, fine tuning both urine composition and blood pH. It is the third urine forming process after filtration and reabsorption.
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About Kidney and Urinary System
The kidney and urinary system remove nitrogenous wastes, regulate water and ion balance, and help maintain blood pH through filtration, selective reabsorption and secretion. Questions cover nephron structure, ultrafiltration, the loop of Henle, collecting ducts, urine formation and the roles of ADH and aldosterone, while distinguishing excretion from egestion.
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