unit 8 vocab Flashcards

1
Q

ameba (pl. amebae)

A

a single-celled eukaryotic organism lacking a definite shape and moving by means
of pseudopodia; also spelled amoeba (pl. amoebae)

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2
Q

arthropod

A

a member of the phylum Arthropoda, which includes crustaceans, insects, and arachnids

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3
Q

atrial

A

of or relating to a body cavity

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4
Q

cestode

A

/ tapeworm; member of the class Cestoda

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5
Q

commensal

A

/ an organism that lives with, on, or in another organism, without injury to either

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6
Q

congenital

A

/ acquired during fetal development, and present at the time of birth, but not inherited

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7
Q

cyst

A

the dormant stage of an organism surrounded by a resistant covering; the nonmotile, nonfeeding stage of
a protozoan parasite; a closed sac-like structure within a tissue

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8
Q

definitive host

A

the host in which the sexual or adult form of the parasite is found

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9
Q

ectoparasite

A

/ a parasite that lives on the outer surface of a host

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10
Q

endemic

A

/ recurring in a specific location or population

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11
Q

endoparasite /

A

a parasite that lives within the host

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12
Q

helminth

A

a worm, especially a parasitic worm; in parasitology, the group comprising the roundworms
and flatworms

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13
Q

host

A

the organism from which a parasite obtains nutrients and in which some or part of the parasite’s life cycle
is completed

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14
Q

immunocompromised

A

having reduced ability or inability to produce a normal immune response

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15
Q

intermediate host

A

the host in which the asexual, immature, or larval form of the parasite is found

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16
Q

larva

A

immature stage of an invertebrate

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17
Q

mechanical vector

A

a vector (usually an arthropod) that is not essential to a parasite’s life cycle but that can transfer
an infective parasite to a noninfected host

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18
Q

nematode

A

roundworm; any unsegmented worm of the class Nematoda

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19
Q

opportunistic parasite

A

an organism that causes disease only in immunocompromised hosts

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20
Q

parasite

A

/ an organism that lives in or on another species and at the expense of that species

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21
Q

pathogenic /

A

capable of causing damage or injury to the host

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22
Q

primary amebic encephalitis (PAM) /

A

rare and usually fatal central nervous system infection caused by Naegleria
fowleri ameba

23
Q

proglottid (pl. proglottids)

A

the tapeworm body segment that contains the male and female reproductive organs

24
Q

protozoa

A

unicellular eukaryotic organisms, both free-living and parasitic

25
Q

reservoir host

A

a host, other than the usual host, in which the parasite lives and is infectious

26
Q

sporozoite

A

the banana-shaped motile infective stage of certain apicomplexan protozoa such as Toxoplasma,
Cryptosporidium, and Plasmodium; in Plasmodium, the stage present in mosquito salivary glands that is
introduced into blood by mosquito bite

27
Q

trematode

A

/ fluke; any parasitic flatworm of the class Trematoda

28
Q

trophozoite

A

the motile feeding stage of protozoan parasites

29
Q

trypomastigote

A

the characteristic developmental stage of trypanosomes, which has a leaf-like form, an undulating
membrane, and usually a free flagellum

30
Q

vector

A

an agent that transports a pathogen from an infected host to a noninfected host

31
Q

ameba (pl. amebae)

A

a single-celled eukaryotic organism lacking a definite shape and moving by means
of pseudopodia; also spelled amoeba (pl. amoebae

32
Q

bradyzoite

A

a slowly multiplying form of coccidian parasite found within tissue cysts and typical of chronic
infection with Toxoplasma gondii

33
Q

formalin

A

/ a 37% solution of formaldehyde used for fixing and preserving biologic specimens

34
Q

granulomatous amebic encephalitis (GAE)

A

rare and usually fatal brain infection caused by Acanthamoeba
species and usually occurring only in immunocompromised individuals

35
Q

micrometer

A

a ruled device for measuring small objects

36
Q

ocular micrometer

A

a clear glass disk that fits in the microscope eyepiece, is etched with an arbitrary scale,
and is used to measure objects viewed with the microscope; also called ocular reticle

37
Q

oocyst

A

the infectious, thick-walled, resistant stage of coccidian parasites, such as Toxoplasma and
Cryptosporidium, which is found in the definitive host of the parasite

38
Q

pinworm

A

Enterobius vermicularis, a small parasitic nematode; seatworm

39
Q

primary amebic encephalitis (PAM)

A

rare and usually fatal central nervous system infection caused
by Naegleria fowleri amebae

40
Q

proglottid

A

the tapeworm body segment that contains the male and female reproductive organs

41
Q

pseudopod/pseudopodium (pl. pseudopods/pseudopodia)

A

a temporary extension of cytoplasm of certain
single-celled organisms such as ameba, that is used for movement and feeding

42
Q

PVA

A

polyvinyl alcohol, a preservative used for fecal specimens

43
Q

tachyzoite

A

a rapidly multiplying stage in the development of the tissue phase of certain coccidians, as in acute
Toxoplasma gondii infections

44
Q

tissue cyst

A

/ intracellular cysts located within host tissues and containing organisms in a state of reduced
metabolism that can survive and remain infectious for years

45
Q

trophozoite

A

he motile feeding stage of protozoan parasites

46
Q

trichrome stain

A

a stain commonly used to identify parasites in fecal smears

47
Q

Anopheles

A

/ the genus of mosquito that is the definitive host for the human malaria parasites
(genus Plasmodium) and that is capable of transmitting the organism to humans

48
Q

babesiosis

A

/ an infection spread by tick bite and caused by protozoan parasites of the genus Babesia

49
Q

Giemsa stain

A

a polychromatic stain used for staining blood cells and blood parasites

50
Q

malaria

A

in humans, a disease caused by infection with protozoan parasites of the genus Plasmodium

51
Q

microfilaria (pl. microfilariae)

A

immature form of a filarial worm

52
Q

parasitemia

A

/ parasites in the blood

53
Q

paroxysm(s)

A

the cycle(s) of chills and fever associated with malaria that occur 36 to 72 hours apart,
depending on the Plasmodium species

54
Q

Plasmodium

A

the protozoan genus that includes the organisms causing human malaria