Excretion
Biology: Edexcel IGCSE, topic 3.4.1
Excretion
Excretion refers to the removal of toxic substances, waste products from metabolism or excess of substances. These substances are excreted by different excretory organs.
Kidneys
- Urea is excreted by the kidneys, along with excess water and salts.
Lungs
- Carbon dioxide is excreted through the lungs.
Skin
- Sweat, containing excess salts and urea, is excreted through the skin.
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Stomata
- Oxygen (a waste product from photosynthesis) is excreted through stomata in leaves.
- Excess carbon dioxide (a waste product from respiration) is excreted through stomata in leaves.
Test yourself on Excretion
Which waste product is excreted by the lungs?