Summary
Practical 2 summary - ZEN161
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A detailed summary for practical 2 of the first year ZEN161 module
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By: dpreez • 1 year ago
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Kingdom AnimaliaPhylum Platyhelminthes
-Faltworms dorsoventrally flattened
-Triploblastic
-Acoelomates (lack body cavity)
-Bilateral symmetry
-unsegmented worms (except the Cestoda)
-Protonephridia for excretion &
osmoregulation
-Most are monoecious - both male and
female reproductive organs
Class Class
Rhabditophora Class Cestoda/
Trematoda Cestoidea
Dugesia
Fasciola
-Aquatic
-2 simple eyespots
hepatica Taenia solium (Pig
(orientate animal (Sheep liver tapeworms)
into direction of fluke) -endoparasites
light)
-Flat, wide, leaf- -have a scolex w/ hooks
-Auricles are shaped & suckers for attachment
sensory lobes on
head w/ -Adults are -lacks mouth & digestive
chemoreceptors endoparasites tract, absorb nutrients
(sensory cells) to -2 suckers, oral directly across the body
help detect food (anterior) and wall
-Pharynx is the acetabulum -long series of repeated
investigative organ (ventral) units (proglottids)
that can be -Monoecious -monoecious
extended when -Causes economic -each proglottid has
feeding losses in sheep male & female repro
-Incomplete farming organs
digestive tract -sheep/human as
-Monoecious definitive host
Schistosoma
haematobium
(Bilharzia) In humans, larvae can hatch
and move through the
-2 suckers intestinal wall into the
bloodstream. They can form
-Dioecious cysts when settling in
-Males: curved body human tissue as cysticerci
that forms a canal when they are distributed
(gynaecophoral) where throughout the body. This
causes the disease
the female is carried cycticercosis. If this
-Infect +2 million happens in the brain,
people/yr neurocysticercosis, it can
be fatal
-symptoms: blood in
stool/urine, fever,
abdominal pains
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