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2014-04-08 22:03:49
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  1. What are some characteristics of Protozoans
    • Unicellular 
    • Eukaryotic 
    • Heterotrophs 
    • Some for cysts to protect is from harsh conditions and allow a parasite to live outside a host (transfer host to host)
  2. Trophozoite
    Is the activated feeding stage of a protozoan
  3. What is the purpose protozoans form cysts
    To protect the protozoan from harsh conditionsAllows it to live outside the host, giving it the ability to transfer host to host
  4. What Protozoan is this? What are some of it characteristics? 
    • Entamoeba histolytica 
    • Cysts that withstand pH of stomach 
    • Excystation occurs in GI tract 
    • Trophozoite causes ulceration of the colon 
    • Feeds on RBCs and bacteria 
    • May have up to 4 nuclei 
    • Shed in feces
  5. What is the transmission and symptoms of Entamoeba histolytica?
    Transmission: Fecal-oral, or contaminated food/water 

    Symptoms: Abdominal pain, diarrhea, bloody stool
  6. What protozoan is this? What are some of its characteristics?
    • Entamoeba Coli
    • Colonize in human GI tract
    • Cysts have 8-16 nuclei
  7. What protozoan is this? What are some of its characteristics?
    • Balantidium coli (cyst and trophozoite) 
    • Same life cycle as Entamoeba 
    • Trophozoite is ciliated, cyst is non-ciliated
  8. Symptoms of Balantidium coli
    • Diarrhea
    • Most people are asymptomatic
  9. What protozoan is this? What are some of its characteristics? 
    • Giardia lamblia (cyst and trophozoite)
    • Causes giardiasis 
    • Flagellated 
    • Attaches to the epithelium of duodenum via ventral sucking disks
    • Cysts are shed in feces 
    • Most infections are asymptomatic 
    • Infects number of mammals (cats, dogs, humans beavers)
  10. What trophozoite is this? What are some of it characteristics?
    • Trichomonas vaginalis 
    • Causes an STD found in both sexes 
    • Most common curable STD in young women
    • Usually asymptomatic 
    • 4 anterior flagella 
    • Trophozoite ONLY; no cyst stage
  11. What trophozoite is this? What are some characteristics? 
    • Trypanosoma brucei 
    • Causes African Sleeping Sickness 
    • Death within a year
    • Two types of hosts Insect(Tsetse fly) and mammalian host
  12. What parasite is this? What are its characteristics? 
    • Plasmodium Vivax
    • Causes malaria 
    • Life cycle involves anopheles mosquito and vertebrate tissue 
    • Merozoites
  13. What is a merotoizte and the protozoan that produces it?
    • It is a daughter cell of the parasite Plasmodium vivax
    • Occurs during asexual reproduction
    • Will infect RBCs
    • Comes from ruptured parasite
  14. Schizont
    • a ruptured parasite
    • Plasmodium vivax 
  15. What protozoan is this? What are its characteristics? 
    • Toxoplasma gondii
    • Sexual phases occur in cat intestines 
    • Cysts are shed in cat feces 
    • Asexual part occurs in another warm blooded animal
    • Most infections are not serious 
    • May effect fetus across placenta, leading to spontaneous abortion, organ damage or still birth