Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
CH 25
vocab
| Term | Definition |
|---|---|
| sessile | organisms that are permanently attached to a surface |
| blastula | a cell-covered, fluid filled ball |
| gastrula | a structure made up of two layers of cells with an opening at one end |
| ectoderm | layer of cells on the outer surface of the gastrula |
| endoderm | layer of cells lining the inner surface |
| mesoderm | 3rd cell layer found in the developing embryo between the ectoderm and the endoderm |
| protostome | when the opening in the gastrula develops into the mouth the animal is called this |
| deuterostome | cells elsewhere on the gastrula |
| symmetry | arrangment of body structures |
| radial symmetry | divided along any plane |
| bilateral symmetry | divided down its length into similar right and left halves |
| anterior | head end |
| posterior | tail end |
| dorsal | upper surface |
| ventral | lower surface |
| acoelomate | animals that develop three cell layers, but no body cavities |
| pseudocoelon | a fluid filled body cavity partly lined with mesoderm |
| coelom | fluid filled space that is completely surrounded by mesoderm |
| exoskeleton | hard covering on the outside of the body that provides a framework for support |
| invertebrate | no backbone |
| vertebrate | has a backbone |
| endoskeleton | internal skeleton |
Created by:
annawestbrook
Popular Biology sets