1. EXCRETION IN DIFFERENT ANIMALS
UNIT 2
The nutrition function
Natural Science 2. Secondary Education
EXCRETION IN DIFFERENT ANIMALS

2. Excretion in different animals
UNIT 2
Excretion in different animals
EXCRETION
ANIMALS WITH NO SPECIALISED PARTS FOR EXCRETION
ANIMALS WITH SPECIALISED PARTS FOR EXCRETION
RESPIRATORY ORGANS
EXCRETORY ORGANS
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Natural Science 2. Secondary Education

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UNIT 2
Excretion in different animals
Animals with no specialised parts for excretion
Sponges and cnidarians eliminate waste through their body surface because most of their cells are in direct contact with the external environment.
A cnidarian (anenome) with no excretory system.
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Natural Science 2. Secondary Education

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UNIT 2
Excretion in different animals
Animals with specialised parts for excretion
Excretion is carried out by:
The respiratory organs
The excretory organs
Malpighian tubules
The respiratory system in a mammal
The excretory systemin an arthropod (Malpighian tubules)
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Natural Science 2. Secondary Education

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UNIT 2
Excretion in different animals
Excretion in respiratory organs
Respiratory organs play a role in excretion by expelling carbon dioxide from breathing.
CO2
The respiratory organs of an arthropod (tracheae)
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Natural Science 2. Secondary Education

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UNIT 2
Excretion in different animals
Excretion in excretory organs
Excretory organs filter the circulating liquid, collecting the waste matter it carries. Later they eliminate this waste directly into the environment or they discharge it at the end of the digestive system, so it is eliminated along with indigestible food.
Examples of excretory organs:
Kidneys (vertebrates)
Malpighian tubules (insects and myriapods)
Nephridia (many invertebrates)
Antennae glands or maxillary glands (crustaceans)
The kidneys of a reptile
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Natural Science 2. Secondary Education