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26 Cards in this Set
- Front
- Back
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bilateral symmetry
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body plan of some organisms in which the body can be divided equally along only one plane
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coelom
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fluid-filled space that is completely covered by muscle
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collagen
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three-stranded protein, unique to animals, that combines to form strong, flexible fibers
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complete digestive tract
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digestive system that has two opening, a mouth and an anus, that are at opposite ends of a continuous tube
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cuticle
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a tough exoskeleton made of nonliving material
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deuterostome
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animal development in which the animal's anus develops before the mouth
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filter feeder
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animal that eats by straining particles from water
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gastrovascular cavity
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saclike digestive space
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hemocoel
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open space between cells in animal tissue
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homeobox
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genes that define the head-to-tail pattern of development in animal embryos; ask called Hox genes
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homeotic
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genes that control early development in animals
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invertebrate
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animal without a backbone
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medusa
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umbrella-shaped body form of a cnidarian in which the mouth and tentacles are on the underside
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mesoglea
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jellylike material that separates the two tissues of a cnidarian
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nematocyst
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capsule containing a thin, coiled tubule with a poisonous barb at one end
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ossicle
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part of the endoskeleton of echinoderms, provide rigidity and protection
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phylum
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group of animals defined by structural and functional characteristics that are different from every other animal phylum
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polyp
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tube-shaped body form of a cnidarian in which the mouth and tentacles face upward
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protostome
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animal development in which the animal's mouth develops before the anus
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pseudocoelom
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fluid-filled space with mesoderm only on one side of the space
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radial symmetry
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arrangement of body parts in a circle around a central axis
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radula
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file-like feeding organ found in mollusks
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segmentation
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repeated sections of an annelid's long body that contain the sane set of body structures, apart from its distinct head and tail region
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sessile
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unable to move from a fixed point
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vertebrate
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animal with an internal segmented backbone
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water vascular system
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system of water-filled canals that extend down each arm of an echinoderm, such as a sea star
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