Edexcel IGCSE Biology · Spec 2.70-2.71
Excretion
What excretion is, the three main excretory organs, and where the waste product urea comes from.
Biology revision video
Excretion
Prefer to watch on YouTube? Open this video on YouTube.
Spec 2.70-2.71
What you need to know
- Define excretion
- Name the main excretory organs and the wastes they remove
- Explain where urea comes from
Active recall
Quick check
Answer each question before opening the answer.
Name an excretory product and the organ that removes it.
Carbon dioxide — lungs; urea — kidneys; excess water and salts — kidneys (and skin in sweat).
Where is urea made and from what?
In the liver, from the breakdown of excess amino acids (deamination).
Biology video companion
Keep your notes and exam practice together
The free Biology workbook follows every video in specification order.