MIC 541-Exam 5-Parisitology 11

  1. What type of parasite is a hookworm?
    Helminth-Nematode-Intestinal Nematode
  2. What type of worm is Necator americanus?
    • Hookworm
    • Intestinal Nematode
  3. Where are Hookworms found geographically?
    • Tropical and subtropical areas
    • High rainfall
    • Warm climate
  4. What percent of the world's population is infected with Necator americanas?
  5. What is the route of infection for Necator americanas?
    Penetrate skin of bare feet
  6. What type of parasite enters the body through bare feet?
    Necator americanas
  7. Describe the lifecycle of Necator americanas:
    • Eggs in feces hatch into larvae in the soil
    • Larvae penetrate feet
    • Transported to lungs
    • Swallowed
    • Mature into adults in the intestines
  8. Where does the adult Necator americanas reside?
    In the small bowel
  9. How does Necator americanas acquire nutrients?
    Sucking blood from the mucosa
  10. What are the symptoms of Necator americanas?
    • Few worms = asymptomatic
    • Iron deficiency anemia
    • Rash
    • abdominal pain
    • Reduced development (in children)
  11. What type of parasite is Toxocara canis?
    Helminth-Nematode-Tissue nematode
  12. What does Toxocaris canis usually infect?
  13. What other type of parasite is Toxocara canis like?
  14. How do you prevent Toxocara canis?
    Worm dogs
  15. What part of the life cycle of Toxocara canis are humans?
    Dead end hosts, not part of lifecycle
  16. What are the symptoms of Toxocara canis in humans?
    • Usually asymptomatic
    • May cause rash, asthma and neurological defects
  17. What is the pathogenesis of Toxocara Canis?
    • Invades tissues
    • Makes granulomas
  18. Cestodes are what type of parasites?
  19. Describe the morphology of Cestodes:
    • Flat
    • Ribbon-shaped
    • Segmented bodies
    • Suckers and hooks on head
    • No digestive tract
  20. What type of parasites have a flat ribbon shaped segmented body?
    Cestodes (Tapeworms)
  21. What part of Cestodes is important for attachment?
  22. What are the specialized features of Cestodes' heads?
    Suckers and hooklets used for attachment
  23. What are Proglottids?
    Reproductive structures
  24. What generates a chain of proglottids on tapeworms?
    The neck
  25. Do Cestodes have a digestive tratc?
  26. How do Cestodes absorb nutrients?
    Through their cuticle
  27. Describe the reproductive system of Cestodes:
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MIC 541-Exam 5-Parisitology 11
MIC 541-Exam 5-Parisitology 11