Term
| Distinguish between protozoa and helminths. |
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Definition
protozoa: trophozoites and cysts, single-celled
helminths: egg, larval, and adult stages (NO trophs or cysts); roundworms (mouth, digestive tract, anus); cestodes (NO digestive tract); trematodes (flatworms, with just incomplete digestive tract) |
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Term
| How many stool samples are required for optimal parasite detection? |
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Definition
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Term
| Distinguish between cysts and trophozoites in terms of stool and environmental resilience. |
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Definition
cysts: thick-walled; resists environmental exposure; in formed stool
trophozoites: cell membrane; sensitive to environment; in watery stool |
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Term
| Distinguish between cysts and trophs in terms of infection and transmission. |
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Definition
| Cysts in feces: actual agent of transmission--->trophs when ingested--->invade intestinal tissue = disease |
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Term
To which major category of parasites do the following characteristics belong?
- hermaphrodites
- require at least one intermediate host
- flat and ribbon-like with head (scolex), cup-shaped suckers and hooks, proglottids
- no digestive system (obtain nutrients through absorption) |
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Definition
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