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Body Cavities of Animals

Acoelomates - no true coelom;

flatworms are an example, only have gastrovascular cavity - not a complete gut;

notice the mesoderm derived tissue (pink)

Remember, animals digest internally.

We are essentially a hollow tube surrounded by

tissues and organs.

Pseudocoelomates - pseudo coelom

Notice how the digestive cavity is not lined by mesodermal tissues

This means that the body cavity is not completely lined with mesoderm

notice with coelomates, the entire body cavity is lined with mesoderm derived tissues, organs will be in coelom space

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