Test #1
Help!
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| list the general characteristics of protozoa | single celled animal like organisims, microscopic, usually motile and divided intio groups based on mode of motility, no cell walls, heterotrophic
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| what are the 3 protozoa phyla | sarcomastigophora, ciliophora, apicomplexa
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| describe amoebas | amoebas move by pseudopodia (false feet) and cytoplasmic streaming. amoebas eat by phagocytosis. most common patogenic amoeba causes amebiasis or amebic dysentary. two life cycles trophozoite (active feeding form) and cyst (dormant survival form)
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| describe flagellates | flagellates move by long whip like structures. ex. Trichomonas vaginalis, and Giardia spp.
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| describe ciliates | move by short hairlike projections ex. Paramecium sp. most common free living parasite, and only one pathogen Balantidium coli causes dysentary
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| outline phagocytosis | the process of engulfing solid particles. food is engulfed and creates a vacoule known as a phagylosome after, this food is broken down by digestive enzymes
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| what is a vector | a organisim that carries and transmits a pathogen
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| characteristics of phylum apicomplexa (sporozoans) | have a complex of organs at the tips of their cells that allow them to enter host cells. have complex life cycles with a spore like stage. most stages are non motile. are obligate intracellular organisims
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| list the general characteristics of parasitic worms | kingdom animalia, no cell walls, heterotrophic nutrition, specialized tissues
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| name the two p. worm phyla | platyhelminthes, and aschelminthes or nematoda (roundworms)
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| describe the 2 parasitic classes of flatworms | class turbellaria free living and non parasitic. class trematoda (flukes) parasitic leaf shaped worms with complx life cycles (many larval forms.many (except the flukes) are hermaphroditic, have incomplete digestive system
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| what is a larva | a immature form that does not look like the adult
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| what does it mean to be hermaphroditic | have both ovaries and testes
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| what is a scolex | its a head
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| what are proglottids | body segments
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| what is an intermediate host | infected by ingesting tapeworm eggs which hatch and form larval cysts in muscle and brain
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| what is an definitive host | infected by ingesting larval cysts, which hatches and grows into the adult
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| characteristics of roundworms | plain, unsegmented worms ranging from microscopic to a foot long. have complete digestive system. capable of movement
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