Animals 1
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25 terms
Terms | Definitions |
|---|---|
 Ingestion | the act of eating |
| Blastula | an embryonic stage that marks the end of cleavage during animal development - a hollow ball in many species |
| Gastrula | embyonic stage resulting from gastrulation in animal development - 3 layers |
| Ectoderm | skin and nerve tissue |
| Endoderm | guts |
| Mesoderm | blood and heart - not in all animals |
| Larva | free-living sexually immature form in some animal life cycles - differ from adult in morphology |
| Metamorphosis | transformation from a larva to an adult |
| Hox complex | genes that regulate expression of other genes |
| porifera | a phylum including the sponges |
| Radial symmetry | any slice through central axis will leave with symmetrical parts |
| bilateral symmetry | two sides are symmetrical. |
| choanocytes | collared cells - cells that filter food - unique to sponges |
| amoebacytes | cells that produce skeletal fibers |
| suspension feeders | filter feeders |
| spongin | collagen-like protein that makes skeleton + flexability of sponges |
| spicule | glassy crystals that help songe maintain structure and protection |
| mesoglea | in cnidarians, the jellylike material located between the ectoderm and the endoderm |
| cnidaria | a phylum including the jelly fish and hydra |
| polyp | cnidaria with columnar, hydra-like body |
| medusa | cnidaria with an umbrella like body |
| planula larva | larval form unique to cnidaria, swims and attaches to a place to become polyp |
| gastrovascular cavity | digestive chamber with a single opening, in which cnidarians, flatworms, and echinoderms digest food |
| Cnidocytes | stinging cells in tenticles |
| nematocysts | capsule inside cnidocytes that sings when triggered |
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