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ch 24
ch 24 vocab
| Term | Definition |
|---|---|
| invertebrate | animals without backbones. |
| exoskeleton | tough outer coverings that provide a framework of support. |
| endoskeleton | internal skeleton animals |
| vertebrate | animals that has an endoskeleton and a backbone |
| hermaphrodite | produce both eggs and sperm in the same animal body. |
| zygote | sperm penetrates the egg to form a fertilized egg. |
| internal fertilization | sperm and egg combine inside the animal's body |
| external fertilization | egg and sperm combine outside the animal's body |
| blastula | cells continue to divide forming a fluid-filled ball of cells |
| gastrula | a two-cell-layer sac with an opening at one end |
| endoderm | inner layer of cells in the gastrula |
| ectoderm | outer layer of cells in the gastrula |
| mesoderm | cell division in some animals continues in the gastrula until another layer of cells |
| symmetry | describes the similarity or balance among body structures of organisms |
| radial symmetry | divided along any plane though a central axis into roughly equal halves |
| bilateral symmetry | divided into mirror image halves only along one plane through the central axis |
| anterior | head end |
| posterior | tail end |
| deuterostome | an anus develops from the first opening in the gastrula |
| filter feeder | gets its food by filtering small perticles from water |
| sessile | attached to and stay in one place |
| cnidocytes | tentacles are armed with stinging cells |
| nematocyst | capsule that holds a coiled threadlike tube containing poison and barbs |
| gastrovascular cavity | the stomich |
| nerve net | cells adapted for digestion cnidarians have a nervous system |
| polyp | tube-shaped body and a mouth surrounded by tentacles |
| medusa | unbrella-shaped body and tentacles that hang down |
| cephalization | tendency to concentrate nervous tissue and sensory organs at the anterior end of the animal |
| dorsal | backside |
| ventral | underside or belly |
| coelom | tissue formed from mesoderm that lines and encloses the organs in the coelom |
| pseudocoelom | fluid-filled body cavity that develops between the mesoderm and the endoderm rather |
| acoelomate | animals that do not have a coelom |
| protostome | mouth develops from the first opening in the gastrula |
Created by:
jasontom
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