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Chapter 25 Vocab
| Term | Definition |
|---|---|
| sessile | organisms that are permanently attatched to a surface |
| blastula | cell-covered, fluid-filled ball |
| gastrula | when the cells on one side of the blastula move inward |
| ectoderm | the layer of cells on the outer surface of the gastrula |
| endoderm | the layer of cells lining the inner surface |
| mesoderm | the 3rd layer of cells between ecto and endoderm |
| protostome | when the opening in the gastrula develops into the mouth |
| deuterostome | cells elsewhere on the gastrula |
| symmetry | describes the arrangement of body structures |
| radial symmetry | can be divided along any plane, through a central axis, into roughly equal halves |
| bilateral symmetry | can be diided down its length into similar right and left halves |
| anterior | head end that has sensory organs |
| posterior | tail end |
| dorsal | upper surface |
| ventral | lower surface |
| acoelomate | animal that develops from 3 cell layers but has no body cavity |
| pseudocoelom | a fluid-filled body cavity partly line with mesoderm |
| coelom | fluid-filled space that is completely surrounded by mesoderm |
| exoskeleton | a hard covering on the outside of the body that provides a framework for support |
| invertebrate | does not have a backbone |
| endoskeleton | internal skeleton |
| vertebrate | has a backbone |
Created by:
_hannahmiley
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