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Ch. 29 questions
Protozoal and Multicellular Parasite Diseases of GI Tract
Question | Answer |
---|---|
List three protozoans that cause intestinal tract infections | Giardia lamblia, entamoeba histolytica, and Cryptosporidium parvum |
What is the definitive host of a helminth? | host in which the sexually mature form grows |
What are the two physiological components (and their functions) of a tapeworm? | scolex--head with sucker/hooks for attachment--proglottids--uteri that fill with eggs |
How is Taenia saginata acquired? | eating tapeworm cysts in undercooked beef |
Describe pinworm (Enterobius vermicularis) spread and detection | spread by scratching anus where eggs are laid--detection--cellophane tape pressed against the anal area and observed microscopically |
Describe the circuitous route of Ascaris | eggs develop into larvae on plants--eaten/swallowed--penetrate intestinal walls pass through lymph and lung coughed up/swallowed reinfect intestinal tract--eggs passed with feces-contaminate plants complete cycle |