Multiple choice

Which of the following metabolic wastes is most toxic to the body tissues?

  1. Ammonia

  2. Urea

  3. Uric acid

  4. Carbon dioxide
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A Correct answer
Explanation

Ammonia is extremely toxic, especially to the CNS, causing cerebral edema and neurotransmitter disruption. Urea is 100,000 times less toxic, uric acid is relatively insoluble but safe, and CO2 is routinely eliminated. Most terrestrial organisms convert ammonia to safer compounds.

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