Which of the following is most toxic?
Correct answer: A. Ammonia
- A. Ammonia
- B. Urea
- C. Uric acid
- D. Trimethylamine oxide
Explanation
Ammonia is the most toxic of these nitrogenous wastes because it interferes rapidly with cellular metabolism and must be diluted with large amounts of water for safe removal. Urea and uric acid are less toxic forms produced by converting ammonia, while trimethylamine oxide is not the usual answer in this comparison; students may choose urea because it is the main human waste.
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About Excretion
Excretion removes metabolic wastes such as carbon dioxide, urea and excess salts, and differs from egestion, which removes undigested food. Questions cover kidney structure, nephron ultrafiltration, selective reabsorption and urine formation, along with the excretory roles of the lungs, skin and liver in maintaining homeostasis.
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