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Parasitology Lec > Trematodes > Flashcards

Trematodes Flashcards

1
Q

Largest trematode infecting humans

A

Fasciolopsis buski

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2
Q

Terminal spined eggs are

seen in ___.

A

Schistosoma haematobium

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3
Q

The ova of this parasite resembles an old fashioned electric bulb and contains a small knob.

A

Clonorchis sinensis

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4
Q

True or False: S. Japonicum inhabits the superior veins of the small intestine.

A

True

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5
Q

True or False: S. haematobium inhabits the portal vein of urinary bladder.

A

False

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6
Q

A term that refers to the parasites that reproduce via separate sexes

A

Dioecious

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7
Q

The general term for (human) infection with flukes.

A

Distosomiasis.

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8
Q

Common name of Fasciolopsis buski.

A

Giant Intestinal Fluke

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9
Q

Common name of Fasciola hepatica.

A

Sheep Liver Fluke.

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10
Q

All flukes are organ-dwelling except ____.

A

Schistosomes

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11
Q

Consumption of infected crab

causes human infection with which trematode?

A

Paragonimus westermani

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12
Q

Which blood fluke is characterized by an egg with lateral spine?

A

Schistosoma mansoni.

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13
Q

TRUE OR FALSE. The male schistosome is more slender than the female.

A

False

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14
Q

TRUE OR FALSE. Some heterophyids have a gonotyl or a genital sucker.

A

TRUE

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15
Q

TRUE OR FALSE. Heterophyid adults release embryonated eggs each with a fully-developed miracidium.

A

TRUE

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16
Q

Fluke
Phylum:
Class:

A

Phylum: Platyhelminthes
Class: Trematoda / Digenea

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17
Q

Infective stage to 1st IH

A

Miracidium

18
Q

T OR F

Trematodes are a group of parasites that in the adult form are primarily segmented, flattened, and leaf-shaped

A

FALSE

Trematodes are a group of parasites that in the adult form are primarily NON-segmented, flattened, and leaf-shaped

19
Q

T OR F

1 miracidium can generate multiple cercariae

A

TRUE

20
Q

terminal larva released from intramolluskan stage

A

Cercaria

21
Q

T OR F

Cercariae are nonmotile

A

FALSE

Cercariae are motile

22
Q

T OR F

Schistosome miracidium are ciliated

A

TRUE

23
Q

dermatitis is caused by

A

schistosome (avian schistosoma) because of their penetration

24
Q

T OR F

All trematodes life cycle require a snail as an intermediate host

A

TRUE

25
Q

Adult stages usually have 2 suckers that serve as

A

Oral sucker, generally smaller than VS, serves as mouth

Ventral sucker, generally bigger than OS, for attachment

EXCEPT for clonorchis sinensis OS is bigger, VS is smaller

26
Q

Circumoral disk / collar of spines / collarette of spines are seen in

A

Echinostoma ilocanum

27
Q

How many collarette of spines are seen in E. ilocanum

A

49-51 spines

28
Q

The pharynx follows the Oral sucker and bifurcates into two into a structure called the

A

intestinal ceca

29
Q

Types of intestinal ceca

A

Simple (unbranched) seen in non-fasciola

Branched seen in fasciola (highly branched)

30
Q

significant for egg development

A

vitellaria

31
Q

Reproductive structures

A

Ovary - usually singular connected to uterus

Uterus - singular coiled structure where eggs are found connected to testes

Testes: come in tandem (two)

32
Q

Miracidium is motile because

A

it is ciliated

33
Q

The process that happens when the miracidium looks for an intermediate host

Unique natural attraction happens between the particular miracidium of the specific parasite to its specific snail host

This allows the miracidium to know where to enter

A

Chemosignaling

34
Q

Inside the snail comes the

A

sporocyst

35
Q

The form of the cercaria when it ejected its tail during penetration

A

schistosomule

36
Q

Schistosoma adult characteristics

A

Dieocious

Gynecophoral canal

37
Q

Unique characteristic of male adult schistosoma

A

gynecophoral canal

38
Q

site for copulation for schistosomes

A

gynecophoral canal

39
Q

testes of schistosomes

A

found in between OS and VS

doesnt come in tandem but comes in several numbers

40
Q

Most number of testes in schistosomes

A

S. mansoni

41
Q

temporary lodgment of fluke in pharynx

A

halzoun / marrara

Parasitology Lec (5 decks)

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