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Unique Physiology
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Jellyfish Characteristics
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Unique Physiology of Jellyfish
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Cnidarians

Cnidarians have very specialized body systems.  Here are some examples:
 
     They digest food using their gastrovascular cavity, which absorbs the nutrients.  They do not need a respiratory system, because their skin is so thin.  They get oxygen by diffusion. 
     Also, cnidarians do not have very much control over movement, and they don't have a brain, they have a so called "nerve net."
 
(Cnidaria)
(Jellyfish)

Red area=Gastrovascular Cavity
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