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Phylum Nematoda (Chapter 27.2). Please set up your notebook for Cornell Notes. Nematodes Characteristics Slender, unsegmented w/ tapered ends Range from microscopic to 1 meter ling Most are free-living, some are parasitic Develop from three germ layers

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phylum nematoda chapter 27 2

Phylum Nematoda (Chapter 27.2)

Please set up your notebook for Cornell Notes

slide2

Nematodes

  • Characteristics
    • Slender, unsegmented w/ tapered ends
    • Range from microscopic to 1 meter ling
    • Most are free-living, some are parasitic
    • Develop from three germ layers
      • Have a body cavity b/w endoderm and mesoderm
        • Pseudocoelomate
    • Have a digestive tract with two openings
slide3

Form and function

    • Feeding
      • Free living worms are predators with grasping mouth parts
      • Soil dwelling and aquatic forms eat algae, fungi or decaying organic matter
    • Respiration, Circulation and Excretion
      • These processes take place by diffusion
slide4

Response

    • Simple nervous system with several ganglia
    • Numerous sense organs
  • Movement
    • Nematodes have muscles that extend the length of the body
    • Use the pseudocoelom and a hydrostatic skeleton
slide5

Reproduction

    • Separate male and female organisms
    • Reproduce sexually using internal fertilization
    • Parasitic roundworms have life cycles that involve two or three host or multiple organs in one host
slide6

Roundworms and Human Disease

    • Trichinosis  caused by Trichinella
      • Mate in intestines of host, larva are released into the blood stream to take up residence in various organs, become inactive cysts in muscles cells
      • Extremely painful
      • Common hosts are pigs and rats
        • Human contract by eating undercooked, infected pork
slide8

Filarial worms  threadlike worms that live in blood and lymph vessels of birds and mammals

    • Transmitted by biting insects
    • Cause elephantitis extreme swelling by to buildup of fluid
slide9

Ascarid worms

    • Ascarislumbricoides
      • Mature in intestine and release eggs in feces
      • Feces can contaminate food or water continuing cycle
      • Causes malnutrition
slide10

Hookworms  soil dwelling

    • Lay eggs in soil
    • Pierce feet to burrow into skin and enter blood stream
    • Consume blood causing weakness and poor growth