Worms

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Shira
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283613
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Worms
Updated:
2014-09-20 13:35:57
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Microbiology
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  1. Platyhelminthes (flatworms) and Nematoda (roundworms) are commonly known as _?_.
    Helminths
  2. _?_ are multicellular eukaryotic animals that generally possess digestive, circulatory, nervous, excretory, and reproductive systems.
    Helminths
  3. _?_ must be highly specialized to live inside their hosts.
    Parasitic helminths
  4. Characterisitics of parasitic worms include:
    • 1. Lack of or reduced digestive system
    • 2. Reduced nervous system
    • 3. Means of locomotion is reduced or lacking
    • 4. Their reproductive system and life cycle is highly developed and complex
  5. Distinguish the difference between parasites and pathogens.
    Parasites derives nutrients from host while pathogens are a disease causing organism.
  6. The four types of Nematodes (Nemotoda) are:
    • Roundworms of humans
    • Pinworms
    • Trichinella
    • Hookworms
  7. The two types of Platyhelminthes are:
    • Tapeworm (cestodes)
    • Blood, Liver, and Lung Flukes (trematodes)
  8. Hosts that harbor larval stages (there may be one, many, or none) are known as the _?_.
    Intermediate host
  9. Host that harbors adult worms (capable of reproduction) is known as the _?_.
    Definitive host
  10. _?_ is the sexually immature stage of a helminth or arthropod.
    Larval stage
  11. Adult helminths may be _?_; male reproductive organs are in one individual, and female reproductive organs are in another.
    Dioecious
  12. Adult helminths may be _?_, or _?_; one animal has both male and female reproductive organs.
    Monoecious; Hemaphroditic
  13. _?_ is the distinctly different appearance of adult male and female organisms.
    Sexual dimorphism
  14. A sac with a distinct wall containing fluid or other material is known as a _?_.
    Cyst
  15. _?_ are cylindrical and tapered at each end.
    Roundworms
  16. The genus name of one of the commmonest human parasites and is intestinal roundworm of humans is _?_.
    Ascaris lumbricoides
  17. The genus name of the intestinal roundworm of pigs is _?_.
    Ascaris suum
  18. The genus name of the worm that lives in the human's large intestines then deposits its eggs in the perianal skin ("itchy butt") is _?_.
    Enterobius vermicularis (human pinworm)
  19. The genus name of the worm that causes trichinosis or trichinellosis in humans is _?_; this involves juvenile worms migrating into muscles of host that mature into the infective stage.
    Trichinella spiralis
  20. The genus name of the small intestinal worm that attaches and feeds off blood in its mature adult form is _?_.
    • Ancylostoma duodenale (duodenum of small intestine)
    • Necator americanus

    *Hookworms
  21. _?_ term referring to thread-like roundworms belonging to the Filarioidea type.
    Filaria
  22. Anthropods that carry pathogentic microorganisms (that lead to infectious diseases) are called _?_.
    Vectors
  23. The genus name of the disease in canines spread by mosquitos is _?_.
    Dirofilaria immitis (Canine Heartworm)
  24. The genus name of the disease in humans causing massive tumors in the limbs or other areas of the body and is also spread by mosquitos is _?_.
    Wucheria bancroftii (Elephantiasis)
  25. The genus name of the disease in humans infected by infected waters and is spread by blackflies is _?_.
    Onchocercus volvulus (River Blindness)
  26. _?_, or tapeworms, are intestinal parasites.
    Cestodes
  27. The head, or _?_, of a cestode has suckers for attaching to the intestinal mucosa of the definitive host.
    Scolex
  28. The body of a cestode consists of segments called _?_ and it is continually produced by the neck region of the scolex, as long as the scolex is attached and alive.
    Proglottids
  29. The genus name of the pork and beef tapeworms of humans is _?_.
    • Taenia saginata (beef)
    • Taenia solium (pork)
  30. _?_, or flukes, often have flat, leaf-shaped bodies with a ventral sucker and and oral sucker.
    Trematodes
  31. The genus name of the fluke that  penetrates human skin (in water), migrates into the blood, and travels to the capillary beds is _?_.
    Schistosoma (Blood fluke)
  32. The genus name of the fluke that infects the human through the ingestion of infected crayfish is _?_.
    Paragonium westermani (Human Lung Fluke)
  33. The genus name of the fluke that infects the human through the ingestion of infected raw seafood is _?_.
    Clonorchis sinensis (Human Liver Fluke)
  34. The genus name of the fluke that infects farm animals (mostly sheep) by the ingestion of infected vegetation is _?_.
    Fasciola hepatica (Sheep Liver Fluke)
  35. How are all flukes passed on to their definitve host?
    Snails (intermediate host) get infected by developing cercariae which in turn becomes metacercariae when it "encrysts" their mode of transmission to the definitve host (ex: vegetation for sheep or crayfish for humans).

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