PLATYHELMINTHES Flashcards
common name
flatworms - drosoventrally compressed
general information
triploblastic- acoelomates- body cavity is absent- celluclar layer called mesenchyme or parenchyma is present, bilateral symmtery -
Body type
unsegmented except taenia- segmneted proglottids var
size range
few mm (10mm dugesia) - several meters of tapewom
form of life
Endoparasites ; taenia solium- fasciola hepartica- schistosoma - parasites of humans
Free living- planaria (dugesia)
digestive system
sac like - branching - poorly developed
absent in tape worm
excretory system
branching tubes havinf bulb like cells in the end called FLAME CELLS -
nervous system
network of nerves and ganglia - sensory organs in the anterior end
respiratory system
absent
circulatory system
absent
nutrition source
parasitic - host
planaria- small animals and dead organic matter
way of living
parasitic - restricted activity and free forms are motile- cillia present on ventral sides
reproduction
both ways
sexxual
hermaphrodite
asexual
binary fission- regeneration as in planaria
larval form
present sometimes
examples
Dugesia - planaria
fasciola hepatica – liver fluke ( f and f)
taenia solium - tapeworm
dugesia
free living
ciliated outer surface
LIVERFLUKE
sheep
occasionally in human beings as well
it has SUCKERS for attachment
completes its life cycle in two hosts- a snail, sheep or a man
lives in the bile duct of the man
taenia solium
human, cattle and pigs - HCP
also completes its life cycle in two hosts
the intermediate host is pig/cattle
body is ribbon like
segmented - segments called proglottids which minly contains sex organs
these segments continue to break foff and pssed out from the intestines through feaces.
PARASITIC MODE OF LIFE (alti)
- absence of epidermis- the presence of resistance cuticle
- adhesive organs- suckers and hooks,
- degeneration of muscular and nervous system
- digestive system is simplified
- complexity of life cycle - presence of 2 hosts
- complicated rerpo systems
reproduction
complicated repro systems
production of OVA in LARGE NUMBERS.
infestation
uterus- zygote- embryo - bud off- cow - man’s intestines (taenia)
TREATMENT
for tapeworm infection- bsides drugs- ANEMA- is also given to patients to fully remove the parasite
