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Medical Parasitology: A Self-Instructional Text, 7th Edition by Leventhal; Cheadle
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Medical Parasitology: A Self-Instructional Text, 7th Edition by Leventhal; Cheadle
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Medical Parasitology: A Self-Instructional Text, 7th Edition by Leventhal; Cheadle
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TEST BANK for Medical Parasitology: A Self-Instructional Text,7th Edition by Leventhal; Cheadle
What is the only schistosome that produces urinary tract disease? -
ANSWER:Schistosoma haematobium
What organs to schistosomes primarily infect (besides the one exception)? -
ANSWER:intestine and liver
Why is Schistosomula most commonly found in tropical regions? - ANSWER:the
geographical distribution of their intermediate host snail
What does chronic schistosomiasis cause in children? - ANSWER:physical growth
defects and cognitive delays
Where is Schistosoma mansoni found? - ANSWER:sub-Saharan Africa, Egypt, Sudan,
parts of the Middle East, parts of South America, and some islands in the Carribean
What is the intermediate host for Schistosoma mansoni? - ANSWER:aquatic snails in
the genus Biomphalaria
What are the reservoir hosts of S. mansoni and do they play a significant role in the
epidemiology of human disease? - ANSWER:baboons and monkeys and no they do
not play a significant role
Where is Schistosomula haematobium found? - ANSWER:most parts of Africa and
some parts of the Middle East
What is the intermediate host for Schistosomula haematobium? - ANSWER:aquatic
snails in the genus Bulinus
What is the reservoir host for S. haematobium? - ANSWER:none
Where is Schistosomula japonicum found? - ANSWER:China, Malaysia, the
Philippines, and to a small extent, Indonesia
What is the intermediate host of Schistosomula japonicum? - ANSWER:amphibious
snails in the genus Oncomelania
What schistosoma species has zoonotic transmission occuring on a regular basis? -
ANSWER:Schistosomula japonicum
What are the reservoir hosts of S. japonicum? - ANSWER:water buffalo, cattle, and
pigs
, Why are there no autochthonous infections of Schistosomula in the United States? -
ANSWER:because there are no appropriate species of intermediate host snails, and
most importantly, sanitary disposal of feces and urine is a general rule
How does fertilization occur in Schistosomula? - ANSWER:they have separate sexes
Schistosome adults remain in_________ during their lifespan, and live attached by
their __________ to the endothelium of the _________ - ANSWER:copula, sucker
disks, veins
Where do S. mansoni adults live in the human host? - ANSWER:the inferior
mesenteric veins that drain the intestine
Where do S. japonicum adults live in the human host? - ANSWER:the superior
mesenteric veins
Where are some other locations that S. japonicum adult worms can end up? -
ANSWER:choroid plexus, the venules around the spinal column, and other ectopic
locations
Where do S. haematobium adults live in the human host? - ANSWER:the venus
plexus that drain the urinary bladder
How long to Schistosome adult worms live for? - ANSWER:5-8 years on average,
although some live as long as 37 years
Schistosomes are faculative anaerobes, what does this mean? - ANSWER:they derive
energy primarily through the degradation of glucose and glycogen
What do adult schistosomes use as their primary source of amino acids? -
ANSWER:hemoglobin
How is hemoglobin ingested by schistosomes? - ANSWER:they employ a
hemoglobinase, digesting the globin portion of the molecule, and detoxifying the
heme moiety into a pigment before it is regurgitated back into the blood stream
What organ does the female schistosome lie within the male? -
ANSWER:gynecophoral canal
What is the structure and function of the gynecophoral canal? - ANSWER:a muscular,
tegumental fold that extends down both sides of the male, and may enable the
female to feed on blood, by assisting in pumping blood into their esophagus
Why don't single sex infections with females, or females experimentally separated
from males not produce eggs? - ANSWER:their inability to obtain a blood meal
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