Chapter 23 Part 2

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Author:
rfgyger
ID:
147849
Filename:
Chapter 23 Part 2
Updated:
2012-04-15 22:39:27
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Bilateral Symmetry
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Bilateral Symmetry
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  1. How many germ layers? what are they?
    3, Endoderm, ectoderm, Mesoderm
  2. What is Endoderm:
    lines most hollow organs
  3. Ectoderm?
    Nerve tissue and tissues that cover the body and line repriatory surfaces..ect: gut
  4. Mesoderm?
    Between endo and ecto, forms muscle and circulatory and skeletial systems
  5. How do Bilaterals move vs. Radials
    Bilaterals are motile, Radials are sessile or drift
  6. Do bilaterals have heads?
    Yes, and go through cephalization, brain
  7. Bilateral are only ones with...
    Heads, and body cavities
  8. what are body cavities?
    fluid cavity between digestive tube and outter wall
  9. Types of Body cavities...
    Coelm, Pseudocoelom, acoelomates
  10. what is a Coelm
    most common body type, fluid filled cavity that is completely lined with a thin layer of tissue that developes from mesoderm
  11. What is pseudocoelom
    Body cavity which is not completely surrounded by mesoderm like the coelm
  12. What are Acoelmates
    No body cavity
  13. What does protostome mean?
    with space between body wall and digestive cavity
  14. what is deuterostome
    as an outgrowth of digestive cavity
  15. What are ecdysozoans?
    Bodys which shed their outer layer
  16. What are iophotrochozans?
    Have special feeding structure
  17. What is an incomplete digestive system?
    Both Mouth and Anus in a single opening
  18. What is a compete digestive system?
    Food processing occurs in tube like enclosure..most insects have

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