Biology GCSE
excretion
What excretion means in Biology GCSE, as defined for AQA, OCR.
Definitions of excretion
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Reference: AQA
Urea is removed in urine by the kidneys, which excretes the nitrogen safely and helps maintain nitrogen balance in the body.
Removal of metabolic waste such as urea and carbon dioxide.
Topics that use excretion
- Maintaining water and nitrogen balance in the body (biology only) (AQA GCSE)
- Ecosystems (OCR GCSE)
Related terms
- abiotic and biotic components
- abiotic factors
- aerobic and anaerobic decomposition
- Ammonia
- biotic factors
- carbon cycle
- carrying capacity
- Cellular respiration
Using excretion in the exam
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