Z Chapter 9 Vocabulary

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Across
  1. 1. having only two germ layers
  2. 3. is the evolutionary process in which the senses become localized in the head region of the body.
  3. 5. having all three germs layers
  4. 8. embryonic stage, usually cup or sac shaped with walls made of two layers of cells.
  5. 11. the innermost layer of an embryo' give rise to the primitive gut /digestive system
  6. 14. "mouth second"
  7. 15. organism lacking a coelom
  8. 16. tissues responsible for movement
  9. 20. "mouth first"
  10. 21. the outer layer of cells in an embryo gives rise to the skin
  11. 22. or somites, individual segments
  12. 24. type of symmetry in which the body can only be divided into mirrored have along one plane, the saggital
Down
  1. 2. the hollow cavity of the blastula
  2. 4. a type of symmetry in which parts of the animal are arranged concentrically around an oral/aboral axis.
  3. 6. a modified type of radial symmetry in which only two planes can be passed through the body along the oral/aboral axis.
  4. 7. animals that possess a coelom
  5. 9. lacking any form of symmetry
  6. 10. the scientific study of tissues
  7. 12. also called metamerism, the serial repetition of similar body parts.
  8. 13. organism having a false coelom
  9. 17. the third 'germ layer' formed in the gastrula, gives rise to connective tissues to name one.
  10. 18. tissues that hold body parts together
  11. 19. tissues responsible for transmitting signals from one place to another.
  12. 23. tissues that line and protect