1 / 15

Body cavity

Body cavity. Acoelomates. FLATWORMS (Phylum _________) May be the 1 st organisms to evolve organs from mesoderm Solid, compact body Organs imbedded in the solid tissue of the body. first to have the three cell layers Ecto/endo/mesoderm Have a digestive tract (one way gut).

kathy
Download Presentation

Body cavity

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Body cavity

  2. Acoelomates • FLATWORMS (Phylum _________) • May be the 1st organisms to evolve organs from mesoderm • Solid, compact body • Organs imbedded in the solid tissue of the body. • first to have the three cell layers • Ecto/endo/mesoderm • Have a digestive tract (one way gut)

  3. Pseudocoelomates • Roundworms (Phylum _________) • Have a body cavity • It’s fluid-filled and partly lined with mesoderm • Enables animal to move more quickly • Muscles attach to the mesoderm and brace against the pseudocoelom

  4. Coelomates • Segmented worms (Phylum ______) • Coelom provides space for development of organs/ organ systems • This allows for membranes like the parietals and viscerals Have a TRUE body cavity • COELOM= fluid-filled space COMPLETELY surrounded by mesoderm. • Coelom cushions and protects internal organs and provides room for them to grow and move independently

  5. B C A ANIMAL PHYLA

  6. 3 4 1 2 9 10 7 8 5 6

  7. Pseudo-coelomate Coelomates Acoelomates Asymmetry

  8. B C A This letter represents the asymmetrical animals on the phylogenetic tree • A • B • C

  9. B C A This letter represents the animals that exist only at the cellular level of organization. • A • B • C

  10. B C A This letter represents the bilateral animals on the phylogenetic tree • A • B • C

  11. B C A Based on the tree, the phylum Annelida is most closely related to: • Mollusca • Cnidaria • Chordata • Arthropoda

  12. A B Pseudocoelomate Based on the phylogenetic tree, the term most likely to appear at location “B” • Radial • Acoelomate • asymmetry • coelomate

  13. Digestive Tube Ectoderm Endoderm Mesoderm Coelom Do You Have A Cavity???

  14. Based on the diagrams below, which organism is most likely to store eggs in its coelom? • A • B • C A B C

More Related