Entamoeba histolytica Overview Quiz
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Questions and Answers

Where is Entamoeba histolytica commonly found?

  • Deserts (correct)
  • Arctic regions
  • Temperate climates
  • Tropical and subtropical regions

    • What is the primary mode of transmission for Entamoeba histolytica?

  • Sexually transmitted
  • Contaminated food or water (correct)
  • Contact with infected animals
  • Airborne particles

    • What feature characterizes the trophozoite of Entamoeba histolytica?

  • Single anteriorly directed pseudopod (correct)
  • Unicellular with a rigid cell wall
  • Highly differentiated ectoplasm and endoplasm
  • Active motility through multiple flagella

    • What initial site is commonly affected by Entamoeba histolytica upon colonization?

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

    What is a characteristic of the primary lesion caused by Entamoeba histolytica?

    <p>Presents without complications</p> Signup and view all the answers

    Which region shows a higher prevalence of Entamoeba histolytica in humid climates?

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

    What is a characteristic feature of Entamoeba histolytica?

    <p>It is a unicellular parasite with a single pseudopod for movement.</p> Signup and view all the answers

    Does Entamoeba histolytica have an intermediate host in its life cycle?

    <p>No, it does not have an intermediate host.</p> Signup and view all the answers

    What is a potential consequence of chronic primary lesions in the large intestine?

    <p>Development of necrotic ulcers</p> Signup and view all the answers

    How long can Entamoeba histolytica cysts survive in moist environments?

    <p>Up to seven days</p> Signup and view all the answers

    What is the primary site for the origin of lesions caused by Entamoeba histolytica?

    <p>Large intestine</p> Signup and view all the answers

    What could happen if amoebic lesions in the large intestine become chronic?

    <p>They might rupture and cause internal bleeding</p> Signup and view all the answers

    What range of cysts can be excreted daily in severe cases of infection?

    <p>30,000 to 45,000</p> Signup and view all the answers

    How does the parasite Entamoeba histolytica typically enter the body?

    <p>Through contaminated food or water</p> Signup and view all the answers

    What type of abscess can form in the liver due to amoebiasis?

    <p>Amoebic liver abscess</p> Signup and view all the answers

    Which of the following is a significant factor in the transmission of amoebiasis?

    <p>Direct contamination from infected feces</p> Signup and view all the answers

    In which regions is Entamoeba histolytica commonly found?

    <p>Tropical and subtropical regions</p> Signup and view all the answers

    Why is proper waste disposal emphasized in the control of amoebiasis?

    <p>To prevent the spread of cysts</p> Signup and view all the answers

    What is the predominant size of the Entamoeba histolytica trophozoite?

    <p>25µm</p> Signup and view all the answers

    How does Entamoeba histolytica primarily transmit to humans?

    <p>Fecal contamination of water and food</p> Signup and view all the answers

    What is the primary reason individuals infected with Entamoeba histolytica can spread the disease without showing symptoms?

    <p>Asymptomatic carriers can excrete cysts</p> Signup and view all the answers

    What happens to the cysts of Entamoeba histolytica once ingested?

    <p>They release amoebae into the intestinal lumen</p> Signup and view all the answers

    What is the first site of colonization for Entamoeba histolytica in the human body?

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

    What type of cellular structure does Entamoeba histolytica have?

    <p>Partially differentiated protoplasm</p> Signup and view all the answers

    Which of the following describes the motility of Entamoeba histolytica?

    <p>Highly active with pseudopodia</p> Signup and view all the answers

    What is the characteristic of primary lesions caused by Entamoeba histolytica?

    <p>They show no inflammation or complication</p> Signup and view all the answers

    Which drug is known to be very effective against intestinal and extra-intestinal amoebiasis?

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

    What is the least effective drug against intestinal amoebiasis according to the information provided?

    <p>Chloroquine phosphate</p> Signup and view all the answers

    During which stage does the amoeba reproduce through binary fission?

    <p>Metacystic Trophozoites</p> Signup and view all the answers

    What action does Diodoquin specifically perform within the intestine?

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

    Which step marks the release of the amoeba from its cyst stage?

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

    What is the main function of the canal system in sponges?

    <p>Facilitating gas exchange and nutrient absorption</p> Signup and view all the answers

    Which cells form the openings (ostia) in the body wall of sponges?

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

    What is the role of choanocytes in the canal system?

    <p>They create a water current for feeding and gas exchange.</p> Signup and view all the answers

    How does the ascon type of canal system differ from more complex systems?

    <p>It has a single cavity known as the spongocoel.</p> Signup and view all the answers

    What structure in asconoid sponges opens to the exterior through a narrow circular opening?

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

    What is a key characteristic of the leuconoid canal system in sponges?

    <p>It arises from the folding of the body wall of the sycon type.</p> Signup and view all the answers

    How does the size of flagellated chambers in the leuconoid system compare to those in syconoid sponges?

    <p>They are smaller.</p> Signup and view all the answers

    What happens to the spongocoel during the formation of the leuconoid canal system?

    <p>It shrinks due to division and shrinkage.</p> Signup and view all the answers

    What types of cells line the flagellated chambers in the leuconoid canal system?

    <p>Choanocytes and pinacocytes.</p> Signup and view all the answers

    What is lost due to the complexity of the leuconoid canal system?

    <p>The radial symmetry.</p> Signup and view all the answers

    What is the primary function of the incurrent canals in the sycon type canal system?

    <p>To facilitate the flow of water into the radial canals</p> Signup and view all the answers

    Which of the following statements about radial canals is correct?

    <p>They end blindly in the body wall.</p> Signup and view all the answers

    What anatomical feature connects incurrent canals to adjacent radial canals in the sycon canal system?

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

    How are the incurrent canals of some syconoid sponges specialized compared to others?

    <p>They have branched structures forming subdermal spaces.</p> Signup and view all the answers

    In syconoid sponges, what is the role of the osculum?

    <p>To serve as the exit point for water</p> Signup and view all the answers

    Which type of cell lines the radial canals in a syconoid sponge?

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

    What initiates the complexity in the sycon canal system from the ascon type?

    <p>The horizontal folding of its walls</p> Signup and view all the answers

    Which part of the sycon canal system allows for water flow towards the spongocoel?

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

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