2(i) Excretion (copy)

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9 Terms

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Definition of Excretion

Removal from organism of toxic materials, waste products of metabolism and substances in excess of requirements

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Definition of Egestion

The discharge of unwanted material from the digestive track.

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Difference between excretion and egestion

  • Egestion removes undigested food or faeces. Excretion removes metabolic waste.

  • egestion removes waste through anus, excretion removes waste through skin kidney or lungs

  • Egestion doesnt happen in cells. Excretion happens in cells.

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Excretion in plants

Oxygen (produced as a waste product of photosynthesis) and carbon dioxide (produced as a waste product of respiration) are excreted from the leaf through the stomata by a process of diffusion.

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3 excretory organs

  • lungs

  • skin

  • kidney

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excretory product of the lungs

carbon dioxide

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Excretory product of the kidney

urine which contains:

  • urea

  • excess water and salts

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Urea

  • urea is nitrogenous waste produced in the liver from the breakdown of excess proteins

  • it is filtered out of the blood into the urine by the kidneys

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excretory product of the skin

excess water and salts