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Flashcards in Parasites Deck (39)
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1

Define Parasite

A parasite is an organism that lives in another organism and gets its food at the expense of its host

2

What is a parasite more complex then

bacteria

3

What are the three classifications of parasites

Protoza
Helminths
Arhropods

4

What are the features of a protozoa parasite

One cell organism
Free living

5

Where do protozoa multiply

Multiply in humans

6

What is a protoza called if found in small intestine or blood

Fecal oral route
Arthropod vector

7

What are three example of protozoa

Malaria
Amoebae
flagellates

8

What are three infections caused by protozoa parasite

Malaria
Amoebic Dysentery
Leishmaniasis

9

What is the parasite injected into the skin by mosquitoes called which causes malaria (what is the most deadliest form of the parasite)

Plasmodium
(plasmodium falciparum)

10

What does plasmodium parasite do in infected humans

Invade RBC, multiply and lyse cells

11

How is malaria diagnosed

Thick and thin blood films H

12

How is malaria controlled

Nets
Prophylaxis

13

Define sporozates

infective agent introduced into a host

14

Define merozoites

a sporozates capable of capable of sexual or asexual development

15

Where does plasmodium sporozates mature as meterozite

The liver

16

What does amoebic dysentry cause

Infection of the intestine causing diarrhoea with blood or pus

17

What parasite causes amoebic dysentry

Entamoeba Histolytica ingesting RBC

18

Define trophozoite

a growing stage in the life cycle of some sporozoan parasites, when they are absorbing nutrients from the host

19

How is amoebic dysentry diagnosed

Microscopy of cyts formed in stools

20

What can occur in amoebic dysentry if disease progresses

Liver abscess

21

What causes Leishmaniasis

leishmania transmitted by the bite of sandflies

22

What does Leishmaniasis cause

Skin or mucosal (internal organs) ulceration

23

How is leishmaniasis diagnosed

histology of biopsy material

24

What are the three types of Helminths (worms)

Nematodes - round worms
Cestodes - tapeworms
Trematodes - flatworms

25

What re two examples of nematodes round worms

Enterobius vermicularis
Ascaris lumbricoides

26

How are round worms diagnosed

ova seen in faeces by microscopy

27

What are enterbius vermicularis

threadlike bacteria that are excreted in the stool, laying eggs in the rectum at night

28

What is the route of Ascaris lumbricoides round worms

ingested eggs hatch in intestine, larvae carry to lungs swallowed again and inhabit and develop in small intestine

29

Ascaris lumbricoides are asymptomatic but a mass of the round worms can cause what

obstruct small intestine or common bile duct

30

What are the examples of tape worms

Taenia saginata (beef) and Taenia solium (pork)
Echinococcus

31

What is the intermediate then definitive host for taenia tapeworms

Larval cysts ingested in meat
Adult tapeworm in human

32

What is Cysticercosis

infection caused by the larvae of the parasite Taenia solium foreign cyts in human tissue

33

What is the life cycle of tape worm parasite Echinococcus

Carried by dogs, humans ingest eggs, form cyts in the liver

34

What is an example of a trematode flatworm and where is it found

Schistosomiasis
Fresh water

35

What is the intermediate host for Schistosomiasis

Snails

36

What is the pathway of Schistosomiasis flatworms in a human

Penetrate human skin, then migrate through lungs to liver where they mature, then they migrate to bladder and lay there eggs

37

What disease can Schistosomiasis flat worms cause

Katayamia fever
Haematuria
Bladder cancer

38

What is also accompanied by a flat worm infection

Increased WBC
Elevated IgE

39

Detection methods

Microscopy
Serology (useful for deep location)

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