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Questions and Answers
What is the characteristic of the excretory system in class Aphasmida?
What is the function of stichocytes in Trichinella spiralis?
Where do the adult stages of Trichinella spiralis live?
What is the result of infection by Trichinella spiralis in humans?
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What is the characteristic of the esophagus in order Trichurida?
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How does the human get infected with Trichinella spiralis?
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What is the feature of the male Trichinella spiralis?
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What is the characteristic of class Phasmida?
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What is the characteristic of the posterior body region in order Oxyurida?
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What is the ploidy of the male and female in order Oxyurida?
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Study Notes
Phylum Nematoda: Class Aphasmida
- Lacking phasmids (caudal sensory organs) and excretory system is absent or reduced
- Males have one spicule or no spicule at all
Order Trichurida
- Anterior end of the worm is more slender than the posterior end
- Esophagus has one or two rows of gland cells called stichocytes along its posterior portion
- Excretory system is absent
- Bacillary bands are present, consisting of glandular and non-glandular cells
- Glandular cells may be involved in ion and osmotic regulation
- Non-glandular cells may be involved in cuticle formation and food storage
Trichinella spiralis
- A parasite of mammals, including humans
- Immature and adult stages can be found in the same host
- Body length is 2-4mm
- Esophagus occupies â…“ - â…Ÿ2 of body length
- Male lacks spicule, but has a copulatory pseudobursa
- Life cycle involves ovoviviparity, with juveniles moving through blood circulation and encysting in skeletal muscles
- Humans are infected by consuming pork flesh infested with cysts
- Infection causes fever, diarrhea, and damage to blood vessels and infected organs
- Stichocytes secretion alters muscle nurse cell function, leading to nuclei hypertrophy and myofibril loss
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Description
This quiz covers the basics of Phylum Nematoda, including characteristics of Class Aphasmida and Order Trichurida, their physical features, and unique biological systems.
