Biology A-Level
Excretion
What Excretion means in Biology A-Level, as defined for OCR.
Definition of Excretion
Check what you remember
Read the wording for your board, then hide it and explain Excretion in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
The removal of metabolic waste products from the body, which keeps the internal environment within limits so metabolism and enzyme activity continue.
Topics that use Excretion
- Excretion as an example of homeostatic control (OCR A-Level)
Related terms
- ADH
- Aquaporins
- Blood markers of kidney function
- Deamination and urea
- Dialysis versus transplant as treatments
- Filtration and reabsorption in the nephron
- Homeostasis and the internal environment
- Hormone detection in urine
Using Excretion in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Biology questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Biology A-Level termsA week of Premium from your first lesson · Then the free plan continues · No card, no charge