3.4.1

Excretion

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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.

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Kidneys

  • Urea is excreted by the kidneys, along with excess water and salts.
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Lungs

  • Carbon dioxide is excreted through the lungs.
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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.

Jump to other topics

1The Nature & Variety of Living Organisms

2Structure & Functions in Living Organisms

3Organism Functions

3.1Respiration

3.2Gas Exchange

3.3Transport

3.4Excretion

3.5Coordination & Response

4Reproduction & Inheritance

5Ecology

6Biological Resources

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