Trematodes and Their Life Cycle
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Questions and Answers

Where are the eggs of tapeworms usually found?

  • Gravid segments (correct)
  • Digestive system
  • Mature segments
  • Circulatory system
  • What is the mode of nutrition for tapeworms?

  • Eating solid food particles
  • Nutrition absorbed through body wall (correct)
  • Absorbing nutrition from the circulatory system
  • Using a digestive system
  • Which system in tapeworms is responsible for excretion?

  • Excretory system with flame cells (correct)
  • Reproductive system
  • Circulatory system
  • Digestive system
  • What is a common feature of the reproductive system of cestodes?

    <p>Having multiple testes and a bilobed ovary</p> Signup and view all the answers

    Where do the ducts of testes and ovary open in cestodes?

    <p>Genital pore</p> Signup and view all the answers

    Which larval stage of cestodes is considered infective for most species?

    <p>Cystic larval stage</p> Signup and view all the answers

    What is the main difference between Schistosoma eggs and eggs of other trematodes?

    <p>Schistosoma eggs are operculated, unlike other trematode eggs.</p> Signup and view all the answers

    Which larval stage of trematodes is characterized by having a cylindrical larva with a collar structure?

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

    What is the final larval stage inside the snail for Schistosoma?

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

    Which host is needed for the asexual cycle of trematodes to begin in soft tissues?

    <p>Intermediate host (snail)</p> Signup and view all the answers

    The lack of a circulatory system is a characteristic feature of:

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

    Which stage serves as the infective stage for schistosomes?

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

    What is the life cycle stage of cestodes that is responsible for causing significant morbidity and mortality among humans in underdeveloped countries?

    <p>Cystic larva</p> Signup and view all the answers

    Why are cestode infections emerging as an important cause of diseases in industrialized countries?

    <p>Mainly in rural areas and among immigrants</p> Signup and view all the answers

    What percentage of global disability-adjusted life years (DALYs) lost do cestode zoonoses account for among all neglected zoonotic diseases?

    <p>Over 75%</p> Signup and view all the answers

    What country was the 68-year-old man from when he moved to the United States?

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

    What did the physician detect during the routine physical examination of the 68-year-old man?

    <p>Enlarged liver</p> Signup and view all the answers

    What radiological study was ordered after the physician detected a mass in the right upper quadrant of the abdomen?

    <p>Ultrasound of the liver</p> Signup and view all the answers

    What is the main function of protozoa?

    <p>Reproduction, digestion, excretion, respiration, etc.</p> Signup and view all the answers

    What was found in the stool examination of the 34-year-old man with fever and crampy abdominal pain?

    <p>Amoeboid trophozoites</p> Signup and view all the answers

    Which resource would be most helpful for detailed information on diagnostic parasitology?

    <p>Paniker's Textbook of Medical Parasitology, 8th ed.</p> Signup and view all the answers

    What is characteristic of the Plasmodium falciparum parasite?

    <p>Presence in blood causing malaria</p> Signup and view all the answers

    What would be an essential focus area when studying Medical Protozoology?

    <p><strong>Life cycle</strong> of protozoa</p> Signup and view all the answers

    What is the function of the ectoplasm in protozoa?

    <p>Serves as an organ for locomotion and food engulfment</p> Signup and view all the answers

    What is the main function of the endoplasm in protozoa?

    <p>Contains the nucleus, golgi bodies, and endoplasmic reticulum</p> Signup and view all the answers

    How many nuclei can some species of protozoa have in a single cell?

    <p>100</p> Signup and view all the answers

    What does the nucleus of protozoa contain?

    <p>Nucleoli or a central karyosome</p> Signup and view all the answers

    Which part of protozoa is responsible for nutrition and reproduction?

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

    What is the significance of the nucleus in protozoa?

    <p>Regulates cell activity &amp; reproduction</p> Signup and view all the answers

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