zoology vocab
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20 terms
Terms | Definitions |
|---|---|
 amebocyte | crawling cells that bring nutrients to rest of body |
| collar cell | draw water into sponge through numerous pores |
| filter feeding | screening food out of water that collar cells pump through body |
| gemmule | food filled ball of amebocytes surrounded by protective coat |
| osculum | opening at top of sponge |
| regeneration | ability to regrow missing parts |
| sessile | attach to surface and dont move |
| spicule | tiny hard particles of calcium carbonate or silicone dioxide |
| sponge | aquatic animals that make up the phylum |
| spongin | network of protien fibers |
| vertabrate | animals with a backbone |
| symmetry | refers to a consistent overall pattern of structure |
| radial symmetry | similar parts branch out in all directions from central line |
| bilateral symmetry | 2 similar halves on either side of a central plane and are said to display cephalization |
| exoskeleton | hard external body covering that provides support for tissues |
| notochord | firm flexable rod of tissue located in dorsal part of body |
| open-circulatory | system in which the fluid never enters vessels |
| gametes | a virus in an organism |
| ectoderm | outermost tissue layer of an organism |
| coelom | a body cavity completely lined with mesoderm |
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