Exploring the Life Cycle of Trematodes
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Questions and Answers

Which of the following is NOT a family of flukes mentioned in the text?

  • Gorgoderoidea (correct)
  • Heterophyids
  • Opistorchiidae
  • Paragonimidae

Which fluke inhabits the pancreas?

  • Heterophyes heterophyes
  • Opistorchis viverrini
  • Metagonimus yokogawai
  • Eurytrema pancreaticum (correct)

Which fluke is the only clinically relevant species in the Philippines?

  • Fasciola hepatica
  • Paragonimus westermani (correct)
  • Opistorchis felineus
  • Clonorchis sinensis

Which of the following is a characteristic of all flukes mentioned in the text?

<p>They require two intermediate hosts (D)</p> Signup and view all the answers

Which stage of the trematode is infective to the 1st intermediate host?

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

What happens to the miracidium if it cannot find a host within 8-12 hours?

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

Which stage of the trematode is responsible for asexual reproduction to form more sporocysts or move to the next stage redia?

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

Which type of cercaria has a big, round to oval head and no stylet in the oral sucker?

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

Which structure is commonly mistaken as the intestine in a trematode?

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

What is the function of the vitellaria in a trematode?

<p>Produce shell material for the eggs (D)</p> Signup and view all the answers

Which drug is the recommended treatment for all trematode infections?

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

Which developmental stage of a trematode is released in water from the egg or inside the first intermediate host?

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

Which class do Trematodes belong to?

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

What are the two orders of Trematodes mentioned in the text?

<p>Order Diplostomida and Order Plagiorchiida (A)</p> Signup and view all the answers

Which family is known as the Blood Flukes?

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

Which family is known as the Intestinal Fluke?

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

Which stage does the Redia mature into in most trematodes?

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

Which stage does the Cercaria encyst to become in the tissue of the 2nd intermediate host?

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

What is the infective stage of blood flukes called?

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

What is the final destination of the adult worms in blood flukes?

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

Which type of cercaria has fins all over its body?

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

Which type of cercaria has a big round head?

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

Which larval stage of the trematode sheds its tail after penetrating the skin of a human?

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

Which stage of the schistosomule's life cycle occurs after it penetrates the human skin?

<p>Heart-lung migration (B)</p> Signup and view all the answers

How does a human get infected with schistosomiasis?

<p>By coming into contact with contaminated water (C)</p> Signup and view all the answers

Where does the schistosomule go after it reaches the human circulation?

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

What happens to the schistosomule after it becomes an adult worm?

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

Where does the adult worm of schistosomiasis reside in the human body?

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

In which region is schistosomiasis most commonly endemic in the Philippines?

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

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