platyhelminthes Flashcards
platyhelminthes
flatwoms
flatworms
soft bodied
internal organs and tissues
has a head
what symmetry do platys have
bilateral
what does Acoelmate mean
without a coelom
whats a coelom
a fluid filled body cavity lined with tissue from mesoderm
endoderm
lines digestive cavity
diagram for acoelmate is shaped like what
a triangle with three layers
what is platyhelm (flat worms) body plan
tube within a tube
what do flatworms breathe excretion and circulation
diffusion
why to flatworms have organ systems
for digestion response excretion and reproductions
who was the flat worms ancestor
parasitic worms with simple body structures
what kind of eaters are flatwoms
carnivores scavengers
how many openings do tape worms have
2 one for anus and one for mouth
pharnyx
muscle tube near mouth extends out of the mouth to pump food into digestive cavity
where does absorbtion and digestion take place
the gut
what do parastitic worms feed on
already digested food
what does diffusion remove
carbon dioxide and waste
what do tapeworms not have
gills or respiratory organs heart and blood
flames cells
found in some flatworms for excretion of excess water can filter ammonium joined in a network of tubes that empties to outside through pores in skin
ganglia
inside of head controls nervous system
do flatworms have eyes
not they have eyespots for detecting light
cilia
help in movement are located on epidermal cells help glide through water
how do flatworms move
cilia , and muscle cells that enable twisting and moving
how do flatworms reproduce
they are hermaphrodites they exchange sperm together
hoe do flatworms reproduce asexually
using fragmentation splitting into 2 and the other half turning into another flatworm
3 types of flatworms
turbellarians flukes tape worms
turbellarians
free living live in the marine
planarian
class: turbellarian cross eyed flatworm
flukes
class trematoda parasitic flatworm in intestinal organs or blood some are external
tapeworms
class cestoda long flat in intestines eats already digested food
scolex
on head contains suckers to hook onto hosts intestinal walls
what is behind the scolex
narrow region that dived into proglotids (sections of tapeworm body
proglottids
the hermaphrodites
how do tapeworms reproduce
they can fertalize their own eggs and proglottides break off and burst then are passed out with feces
how do tapeworms enter intermediate hosts
zygotes infect water which hosts drink
tapeworm life cycle
form as larvae in intermediate hosts then go into dormant stage when ingested by human then become actuve and grow into worms
cyst
dormant larvae stage in tapeworms