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Questions and Answers
Which of the following is true about nematodes?
Which of the following is true about nematodes?
- Aphasmids have caudal chemoreceptors. (correct)
- They have a life cycle consisting of only two stages.
- They cannot infect extraintestinal tissues.
- They do not have distinct physical characteristics for males and females.
What is the difference between oviparous and ovoviviparous/oviviparous nematodes?
What is the difference between oviparous and ovoviviparous/oviviparous nematodes?
- Oviparous nematodes lay eggs in an unsegmented stage, while ovoviviparous/oviviparous nematodes lay eggs in a segmented stage (correct)
- Oviparous nematodes lay eggs in a segmented stage, while ovoviviparous/oviviparous nematodes lay eggs in a segmented and unsegmented stage
- Oviparous nematodes lay eggs in a segmented stage, while ovoviviparous/oviviparous nematodes lay eggs in an unsegmented stage
- Oviparous nematodes do not lay eggs, while ovoviviparous/oviviparous nematodes lay eggs in a segmented stage
Which of the following is true about the Triad of infection or Unholy 3?
Which of the following is true about the Triad of infection or Unholy 3?
- It consists of Capillaria, Ascaris, and Strongyloides.
- It consists of Ascaris, Strongyloides, and Hookworm.
- It consists of Enterobius, Ascaris, and Trichuris.
- It consists of Hookworm, Ascaris, and Trichuris. (correct)
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Study Notes
- There are separate sexes in nematodes with distinct physical characteristics for males and females.
- Nematodes have a life cycle consisting of egg, larval, and adult stages.
- Aphasmids lack phasmids or caudal chemoreceptors, while phasmids have caudal chemoreceptors.
- Nematodes can be oviparous, ovoviviparous, or viviparous/larviparous.
- The frequency of nematodes in the intestine is EAT (Enterobius, Ascaris, Trichuris) for small intestines and CASH (Capillaria, Ascaris, Strongyloides, Hookworms) for large intestines.
- Some nematodes migrate from the heart to the lungs, and this is known as the ASH (Ascaris, Strongyloides, Hookworm) migration.
- Some nematodes can infect extraintestinal tissues such as lymphatics, subcutaneous tissues, muscles, and meninges.
- The Triad of infection or Unholy 3 is HAT (Hookworm, Ascaris, Trichuris).
- Amphid are cephalic chemoreceptors in nematodes.
- Oviparous nematodes lay eggs in an unsegmented stage, while ovoviviparous/oviviparous nematodes lay eggs in a segmented stage.
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