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Hydrostatic skeletons - muscles surround a fluid-filled cavity that supports the muscles.; when the muscles contract, they push against fluid in the body cavity, causing the body to change shape (in annelids and certain cnidarians)
Exoskeleton - external skeleton; a hard body covering made of chitin; move by using muscles attached to the inside of the exoskeleton; these muscles bend and straighten the joints (in arthropods)
Endoskeleton - a structural support located inside the body; made of calcified plates; plates support and protect, the animal, and gives them a bumpy and irregular texture (in sea stars and other echinoderms, vertebrates, sponges)
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∙ 13y ago
Anonymous
invertibrate skeletal sysytem
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