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 (C)</p> Signup and view all the answers

How long is the adult parasitic female of Strongyloides stercoralis?

<p>2 mm long (B)</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>â…“ of the body length from the posterior end (B)</p> Signup and view all the answers

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

<p>Colorless (B)</p> Signup and view all the answers

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

<p>225 µm in length (C)</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 (A)</p> Signup and view all the answers

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

<p>Tapered conical posterior end cuticle (B)</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 (B)</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 (A)</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 (C)</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 (C)</p> Signup and view all the answers

What is the infective stage of C.philippinensis?

<p>Larva (A)</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 (A)</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 (A)</p> Signup and view all the answers
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