Combined Science GCSE
urea
What urea means in Combined Science GCSE, as defined for AQA.
Definitions of urea
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Reference: AQA
A toxic substance made in the liver from the nitrogen of removed amino groups, which must be excreted rather than stored in the body.
A waste product made in the liver from the breakdown of excess amino acids, which diffuses from cells into the blood plasma.
Topics that use urea
- Diffusion (AQA GCSE)
- Metabolism (AQA GCSE)
Related terms
- Adaptations of exchange surfaces
- Aerobic respiration
- Amino acids
- Anaerobic respiration
- Blood supply
- Cell size and organism size
- Cellulose
- Concentration gradient
Using urea in the exam
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