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The Worms

The Worms. Phylum Platyhelminthes Phylum Nematoda Phylum Annelida. Phylum Platyhelminthes = Flatworms. Special Structures:. Ganglia. Eye spot. Ganglia – group of nerve cells. Flame Cells - specialized cells that remove waste

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The Worms

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  1. The Worms Phylum PlatyhelminthesPhylum NematodaPhylum Annelida

  2. Phylum Platyhelminthes = Flatworms • Special Structures: Ganglia Eye spot Ganglia – group of nerve cells Flame Cells - specialized cells that remove waste materials Pharynx - Food is drawn through this tube Nerve cord Gastrovascular cavity Flame cells Pharynx Mouth

  3. Phylum Platyhelminthes = Flatworms • Body symmetry: Bilateral • Body cavity: acoelomate • Respiratory, Circulatory: diffusion • Excretory: flame cells

  4. Phylum Platyhelminthes = Flatworms • Response:ganglia (simple) • Feeding:carnivores or parasitic • Movements: Cilia and muscle cells • Reproduction:sexual (hermaphroditic)

  5. P2 = slate • Write down 2 questions about phylum platyhelminthes that might be asked on a test. (leave space for an answer) • Trade slates with a partner and answer the questions they wrote.

  6. Phylum Platyhelminthes = Flatworms • Examples:Planaria, Fluke, Tapeworm

  7. Tapeworms • The largest tapeworms can grow up to 58ft long • You can become contaminated by eating infected food • They harm what they are living in by stealing vital nutrients. (House episode)

  8. Flukes • Humans ingest the eggs of flukes by eating raw fish, or eating the plant stalks of bamboo or other things that grow in a moist fresh water. • Most common in Asia

  9. Phylum Nematoda = Round Worms mouth Retract piercing device • Special Structures: pharynx Dioecious - each organism is only one sex; separate sexes Hydrostatic skeleton - layers of circular and longitudinal muscles, together with the water in the gastrovascular cavity, that enable movement Sense organs - neuron that reacts to a specific stimulus, such as light intestine pseudocoelom anus

  10. Phylum Nematoda = Round Worms • Body symmetry: Bilateral • Body cavity: Pseudocoelomates • Respiratory, Circulatory, Excretory: diffusion • Response:ganglia (simple), sense organs (detect chemicals)

  11. Phylum Nematoda = Round Worms • Feeding:parasitic • Movements: muscles, hydrostatic skeleton • Reproduction:sexual  dioecious

  12. P2 = slate • Write down 2 questions about phylum nematoda that might be asked on a test. (leave space for an answer) • Trade slates with a partner and answer the questions they wrote.

  13. Phylum Nematoda = Round Worms • Examples:trichinosis, filarial worms, Ascaris, hookworms

  14. Trichinosis • Caused by eating raw pork • Biblical reasoning to not eat pork

  15. Ascaris • Effect the intestine and can cause a blockage. • Most symptoms are diahhrea, nausea, etc.

  16. Filarial worms • Contracted by horse fly or deer fly also causes elephantitis

  17. hookworms • Humans can contract hookworms by walking barefoot on contaminated soil. • Also by eating improperly washed vegetables

  18. Pin worm • Scratching infected area and touching someone else and passing on eggs. Then they are ingested and the process occurs again.

  19. Phylum Annelida = Segmented Worms • Special Structures: anus Satae – external bristles for movement satae metameres gizzard crop clitellum mouth brain nephridia ganglia

  20. Phylum Annelida = Segmented Worms • Body symmetry: Bilateral • Body cavity: Coelomates • Respiratory: gills (aquatic) or through skin • Circulatory: closed circulatory system

  21. Phylum Annelida = Segmented Worms • Excretory: Nephridia • Response: Brain with dorsal & ventral nerve cords, some sense organs • Feeding: aquatic – filter feeders; detritivores; parasitic • Movements: satae, muscles, hydrostatic skeleton • Reproduction: sexual & some hermaphroditic

  22. P2 = slate • Write down 2 questions about phylum platyhelminthes that might be asked on a test. (leave space for an answer) • Trade slates with a partner and answer the questions they wrote.

  23. Phylum Annelida = Segmented Worms • Examples: earthworm & leech

  24. leeches • Attach to their host until they are full and then fall off to digest. • In some cases a leech carries the diseases from prior hosts and infects the new host (HIV, Hepatitis).

  25. Assignment • Choose an article about a parasitic worm from one of the phyla discussed today. • Create an informational brochure about the parasite you chose. • Your brochure must include illustrations (picture of parasite, life cycle, etc) You may use you book for help, Chp. 27

  26. Ticket out • On a piece of paper, create a chart comparing 5 characteristics between the three phyla discussed today.

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