alleryStart learning →What makes up human urinary nitrogen waste?
AMostly ammonia with a little urea
BMostly urea with a little ammonium
CMostly uric acid with a little urea
DMostly ammonium with a little urea
Answer & Solution
Correct answer: B. Mostly urea with a little ammonium
1. Deamination of amino acids converts the amino group into ammonia, ammonium ion, urea or uric acid.
2. Ammonia is extremely toxic, so most of it is rapidly converted into urea in the liver.
3. Human urinary waste is therefore primarily urea, with small amounts of ammonium.
4. Very little uric acid appears, so no option built around it can be right.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 25 "The Urinary System", section 25.9 Regulation of Fluid Volume and Composition_
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