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Platyhelminthes

Platyhelminthes. Simona Tcherneva Tiffany Kukla. Germ Layers. Three primary Ectoderm: raises the outer epithelium Endoderm: raises the lining of the gut tract Mesoderm: raises tissue between endoderm and ectoderm (muscle, excretory structures, and parenchyma or undifferentiated cells.

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Platyhelminthes

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  1. Platyhelminthes Simona Tcherneva Tiffany Kukla

  2. Germ Layers • Three primary • Ectoderm: raises the outer epithelium • Endoderm: raises the lining of the gut tract • Mesoderm: raises tissue between endoderm and ectoderm (muscle, excretory structures, and parenchyma or undifferentiated cells

  3. Coelom • NONE!

  4. Digestive Tract • One opening for taking in food and letting out waste

  5. Cephalization • Yes, there is a concentration of nerves • Have light sensitive organs called ocelli • Balance and water movement receptors

  6. Segmentation • Not segmented • Have spaces between internal organs filled by Parenchyma

  7. Skeleton and Appendages • No real skeleton • Mesenchyme (a connective tissue made of cells and collagen fibers) acts as a skeleton • Provides points of attachment for muscles • Contains all internal organs • Waste products, nutrients and oxygen pass through it

  8. Circulatory System • Not specialized • Nutrients pass through body by diffusion

  9. Respiratory System • Not specialized • Respiration through the whole surface of the body (makes them vulnerable to fluid loss)

  10. Reproduction • Some species of flatworms begin the mating process with penis fencing, a duel in which each tries to impregnate the other • The loser of the duel must develop the egg • http://www.pbs.org/kcet/shapeoflife/episodes/hunt_explo2.html

  11. Habitat • Places where dehydration is unlikey • Ex. Water or by water

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