Coelom and Body Cavities

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Last updated 4:51 PM on 3/22/26
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5 Terms

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Coelom

Fluid filled body cavity surrounding gut where organs are suspended - more space, surface area, structural support, complexity

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Importance of Coelem

Cushioned space for organ development, organs grow/function independently, and more complex body plans

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<p>Acoelomate</p>

Acoelomate

Animals that lack a coelom entirely; internal organs embedded directly in mesodermal tissue (flatworms - platyhelminthes)

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<p>Pseudocoelomate (Blastocoelomate)</p>

Pseudocoelomate (Blastocoelomate)

Animals with body cavity lined by mesoderm and endoderm, not fully mesodermal (roundworms - Nematoda)

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<p>Eucoelomate (True Coelom)</p>

Eucoelomate (True Coelom)

Animals with body cavity fully lined by mesodermal tissue (vertebrates, annelids, mullusks)