Podcast
Questions and Answers
Where does the embryonation of Ascaris lumbricoides eggs take place?
Where does the embryonation of Ascaris lumbricoides eggs take place?
- In the liver of the host
- During migration in the pulmonary circulation
- Inside the host's intestine
- In the soil outside the host (correct)
What is the route taken by the immature parasite after being swallowed?
What is the route taken by the immature parasite after being swallowed?
- It migrates to the heart and then to the liver
- It remains in the intestinal lumen until it matures
- It travels through the bloodstream directly to the small intestine
- It penetrates the intestinal wall and then migrates to the lungs (correct)
What is responsible for causing 'verminous' pneumonia in Ascaris lumbricoides infection?
What is responsible for causing 'verminous' pneumonia in Ascaris lumbricoides infection?
- The larva feeding on parenchymal tissue in the liver
- The larva penetrating the intestinal wall
- The larva becoming stuck in an alveolar capillary (correct)
- The larva migrating through the bronchi into the trachea
What characterizes the most intense host reactions during Ascaris lumbricoides infection?
What characterizes the most intense host reactions during Ascaris lumbricoides infection?
How does Ascaris lumbricoides complete its life cycle after reaching the lumen of the small intestine for a second time?
How does Ascaris lumbricoides complete its life cycle after reaching the lumen of the small intestine for a second time?
Study Notes
Ascaris lumbricoides Life Cycle
- Embryonation of Ascaris lumbricoides eggs takes place in the soil.
Migration of Immature Parasite
- After being swallowed, the immature parasite migrates through the wall of the small intestine, enters the bloodstream, and reaches the liver.
- From the liver, it migrates to the heart, and then to the lungs.
Pathology of Ascaris lumbricoides Infection
- The immature parasite's migration to the lungs causes 'verminous' pneumonia.
- The most intense host reactions occur during the lung phase of the infection, characterized by eosinophilia and inflammation.
Completion of Life Cycle
- After reaching the lumen of the small intestine for the second time, Ascaris lumbricoides matures and begins to produce eggs.
- The eggs are then excreted in the feces, and the cycle repeats.
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Description
Test your knowledge on the mode of infection of Ascaris lumbricoides, one of the largest nematodes to infect humans. Learn about the life cycle of this parasite and how it is transmitted to humans.
