Biology Questions and Answers
- What are the two main
species of taenias that cause
human diseases?
The two mains spcause disease in humans arecies of taenias thate Taenia
solium, Taenia sagior the pork tapnata, or the beef tapeworm.eworm, and
Besides these species there are still thefish tapeworm, or Diphyllobothrium
latum, and a tapeworm, Echinococcus
granulosus,cause in humans t which lives ihe severe diseasen dogs and (^)
known as hydatid echinococcosis. disease, or
- How do taenias obtain
food and make gas exchange?
Tapeworms have hooks and suckingstructures on their heads (scolex) that (^)
fixate the parasite in structures often do not injure the hostthe gut wall; these
tissue. The parasite obtains food and
makes gas exchaand diffusion across itsnge through absorption skin; since it is a
platyhelminth it does not have a
digestive system osystem. r a circulatory
- What are the segments
that form the body of the
tapeworm called? What is
their function?
The body of the tapeworm is masegments called proglottids. Thede of
proglottids are reproductive structures
of the taenia and contain ththat produce male and female e organsgametes. (^)
As the proglottids become distant from
the scolex (proglottids can fecundate themshead) they mature. Maturelves ore (^)
neighboring ones and the eggs formed
are storecalled pregnant proglottids, full of eggs,d inside them. Proglottids (^)
detach from the body of the worm and
are eliminated with the human feces.
- Concerning their
respective intermediate hosts
how different are Taenia
solium and Taenia saginata?
The intermediate hosts of Taenia solium
are pigs and the intermTaenia saginata are cattle.ediate hosts of - What is the life cycle of a
tapeworm?
Pregnant proglottidsare released together with human feces. with taenia eggs (^)
If ingested bswine or bovine, the eggs break insidy the intermediate hosts,e (^)
their intestines and the larva trespass
the mucosa and gains thsettle on muscles, heart, be circulation torain and
other organs of these animals and then
differentiate into cysticcysticerci. Humans become infected larvae called
when eatinor bovine meat contaminateg raw or badly cookd byed swin e
cysticerci. In the human intestines the
cysticercithe cycle g develop into adult worms anoes on. d
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