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7 Cards in this Set
- Front
- Back
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what do sponges lack?
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mouth, gut, specialized tissues or organ tissues
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collar cells
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one of the cells forming the wall of a sponges central cavity; creates current that moves water through sponge pores into central cavity
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osculum
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large hole through which water exits the central cavity of a sponge
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spicules
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one of the thin, spiny structures that form the skeleton of a sponge
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amebocyte
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sponge cell that builds spicules from calcium carbonate or silica
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spongin
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protein that makes up the skeleton of some sponges
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gemmules
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sphere-shaped collections of amebocytes surrounded by a toug layer of spicules, can survive harsh temps and when conditions are favourable they grow into new sponges
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