Ammonia is not allowed to accumulate in the body but is rapidly converted to urea because ammonia is
Correct answer: B. highly toxic even in low concentrations
- A. too large a molecule to transport
- B. highly toxic even in low concentrations
- C. needed for protein synthesis
- D. insoluble in water
Explanation
Ammonia raises pH and poisons cells, particularly neurons, so it must be detoxified at once. Urea is far less toxic and soluble enough to travel safely to the kidney.
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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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