Intestinal Nematodes
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Questions and Answers

Which sensory organ is used for the characterization of medically important nematodes?

  • Antennae
  • Taste buds
  • Phasmids (correct)
  • Eyes

    • What is the life cycle stage of the larva that is infective and non-feeding?

  • Adult
  • Filariform (correct)
  • Rhabditiform
  • Egg

    • How are medically important nematodes different from segmented organisms?

  • They lack repeating segments with complete reproductive parts (correct)
  • They have a complete digestive tract
  • They have a circulatory system
  • They are not bilaterally symmetrical

    • What is the Phylum of Strongyloides stercoralis?

    <p>Nematoda</p> Signup and view all the answers

    How long is the adult parasitic female of Strongyloides stercoralis?

    <p>2 mm long</p> Signup and view all the answers

    In which part of the body is the vulva located in the adult parasitic female of Strongyloides stercoralis?

    <p>⅓ of the body length from the posterior end</p> Signup and view all the answers

    What is the color of the adult parasitic female of Strongyloides stercoralis?

    <p>Colorless</p> Signup and view all the answers

    What is the approximate size of the rhabditiform larva of Strongyloides stercoralis?

    <p>225 µm in length</p> Signup and view all the answers

    Which feature distinguishes the filariform larva of Strongyloides stercoralis from the rhabditiform larva?

    <p>Distinct cleft at the tail</p> Signup and view all the answers

    What characterizes the free-living adult female Strongyloides stercoralis morphology?

    <p>Tapered conical posterior end cuticle</p> Signup and view all the answers

    Why should hookworms always be kept in mind when discussing Strongyloides?

    <p>They have a similar route of infection through skin penetration</p> Signup and view all the answers

    What is the size of C.philippinensis eggs?

    <p>35-45 μm in length and 20-25 μm in width</p> Signup and view all the answers

    What distinguishes the eggs of C.philippinensis?

    <p>Elongated or peanut shaped with a thick, radially-striated shell</p> Signup and view all the answers

    What does autoinfection in C.philippinensis refer to?

    <p>Live larvae directly produced may reinvade the intestinal mucosa and repeat the life cycle</p> Signup and view all the answers

    What is the infective stage of C.philippinensis?

    <p>Larva</p> Signup and view all the answers

    How are fish infected with C.philippinensis?

    <p>By ingesting eggs passed in stool which may contaminate water sources</p> Signup and view all the answers

    What distinguishes the first-generation adult females of C.philippinensis?

    <p>Release eggs with thin shells and larva</p> Signup and view all the answers

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