- A Liver
- B Kidney
- C Lungs
- D Pancreas
Correct answer: A. Liver
Explanation: Ammonia produced from protein metabolism is converted to the less toxic urea in the liver via the ornithine cycle, then transported to kidneys for excretion.
Concept context
Nitrogenous waste, kidney structure, urine formation in the nephron, and hormonal regulation of excretion.
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