Ch. 31 Biology

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patterson911
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51370
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Ch. 31 Biology
Updated:
2010-11-23 15:20:19
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Animal Origins Body Plans
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Ch. 31 Biology
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  1. External appendages do what?
    Enhance locomotion
  2. Body segmentation?
    • Allow better control of movement.
    • May not be apparent externally
  3. What are the body cavity functions?
    • · Cushions suspended organs
    • · Acts as a hydrostatic skeleton against which muscles can work (soft-bodied animals)
  4. Coelomate?
    • mesoderm surrounds body cavity (coelom) and organs
    • Ectoprocts, nemerteans, phoronids, brachiopods, annelids, mollusks and arthropods
  5. Pseudocoelomate?
    mesoderm surrounds body cavity (pseudocoel) but not internal organs
  6. Acoelomate?
    • no fluid-filled body cavity
    • Flatworms
  7. What are the three types of body cavities?
    • Acoelomate
    • Pseudocoelomate
    • Coelomate
  8. Where is the body cavity located?
    between digestive tract and outer body wall
  9. Bilateral is?
    • Only 1 plane through midline divides animal into mirror-image halves.
    • *cephalization
  10. Radial are and is?
    • (cnidarians and ctenophores)
    • Any plane along central axis divides animal into similar halves.
  11. Aymmetrical are?
    sponges
  12. What are the three types of symmetry?
    Asymmetrical, Radial, Bilateral
  13. Animal Body Plans Vary in 4 features. What are the four features?
    Symmetry, Body cavity, Body segmentation, External appendages
  14. Triploblastic animals divided into 2 groups. What are those two groups?
    protostomes and devitrosomes
  15. Characteristics of animals are?
    • · 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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