In humans, ammonia is converted into urea in the
Correct answer: B. liver
- A. kidney
- B. liver
- C. lungs
- D. intestine
Explanation
The liver runs the ornithine cycle, turning toxic ammonia from amino acid breakdown into urea, which the kidneys then filter out. Without the liver this conversion, ammonia would accumulate fatally.
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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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