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What are the body cavity functions?
- -- Cushions suspended organs
- -- Acts as a hydrostatic skeleton against which muscles can work (soft-bodied animals
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Coelomate?
- mesoderm surrounds body cavity (coelom) and organs
- (Ectoprocts, nemerteans, phoronids, brachiopods, annelids, mollusks and arthropods)
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Pseudocoelomate?
mesoderm surrounds body cavity (pseudocoel) but not internal organs
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Acoelomate?
- no fluid-filled body cavity
- (Flatworms)
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The body cavity is locate where?
located between digestive tract and outer body wall
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What are the types of body cavity's?
Acoelomate, Pseudocoelomate, Coelomate
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What is an example of bilateral symmetry?
- (cnidarians and ctenophores)
- Any plane along central axis divides animal into similar halves.
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What is an example of bilateral symmetry?
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Only 1 plane through midline divides animal into mirror-image halves.*cephalization
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What is an example of asymmetrical symmetry?
sponges
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What are the types of symmetry?
asymmetrical, bilateral, radial
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Animal body plans vary in four features. What are these four features?
symmetry, body cavity, body segmentation, external appendages
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Characteristics of animals are?
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· Muliticellular, heterotrophic eukaryotes
- · Ingest food and digest internally
- · Cells lack cell walls
- · Most have tissues and capable of movement
- · Most reproduce sexually (diploid stage usually dominates life cycle)
- · In most, a small flagellated sperm (n) fertilizes a larger, nonmotile egg (n) to form a zygote (2n)
- · Embryonic development regulated by Hox genes; includes cleavage and gastrulation
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What 2 groups are triploblastic animals divided into?
protosomes and devitrosomes
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