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Bell work

Stay updated with test dates, journal submissions, tutoring sessions, and quiz protocols for your biology class. Learn about worm phyla characteristics and examples of different types of flatworms, roundworms, and segmented worms.

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Bell work

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  1. Bell work 1.

  2. General Reminders If you did not pass your exam remember you must come in to AST to correct your test and retest for a higher grade. Saturday School 4/2 9:00-12:00 Test date 4/7 Journals Due 4/7 EOC Tutoring Tuesday 7:35-8:15 in Mrs. Owens’ Room 1241 Tuesday 3:50-4:30 in Mrs. Cochrane’s Room 1228 Wednesday 7:35 – 8:15 in Coach Rich’s Room 1107 Thursday 7:35-8:15 in Mrs. Schneider’s Room 1240 Thursday 3:50-4:30 in Mrs. Schneider’s Room 1240

  3. QUIZ Clear your desks of everything Use CAPITALletters please Keep your answers covered If you need to make up a quiz due to an absence… come see me Tues or Thurs during AST Flip it over when you are finished and hang on to it.

  4. Today’s Objective: OBJECTIVES: Describe and Explain the characteristics of the different worm phyla

  5. The Worms Phylum PlatyhelminthesPhylum NematodaPhylum Annelida

  6. 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

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

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

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

  10. 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)

  11. 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

  12. 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

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

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

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

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

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

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

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

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

  21. Phylum Annelida = Segmented Worms • Special Structures: anus Nephridia– excretory organ that filters fluid in the coelom (primitive kidney) Clitellum– secretes a mucus ring into which eggs and sperm are released and then forms a protective cocoon Septa– thin walls that separate body segments setae Setae– external bristles for movement Metameres– body segments metameres gizzard crop clitellum mouth brain nephridia ganglia

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

  23. 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

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

  25. 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).

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