Platyhelminths Flashcards
(29 cards)
“<b>Why aren’t Platyhelminths worms?</b>”
“they don’t have metamatric segmentation and are flattened, no true body cavity, have protonephridia instead of nephridia & their cephalisation is not as defined”
“<b>How do cercomeromorpha attach to host?</b>”
“use scolex, suckers, hooks<br></br><b><br></br></b><img></img>”
“<b>how do cestoda digest nutrients?</b>”
across surface
“<b>How do cerocomeromorpha prevent from being digested in intestines?</b>”
by having a cuticle
“<b>How do turbellaria (Dugesia sp.) eat?</b>”
may spew digestive enzymes, mouth & pharnyx
“<b>What is the life cycle of a Schistosoma sp?<br></br></b><img></img>”
blood fluke<br></br>1. eggs passed through human feces 2. ingsted by molluscs 3. free swiming larvae breaks through human skin/blood vessels 4. reproduce in our bladders
“<b>Where is the ganglia located in Turbellaria?</b>”
in their head & connects to nerve cords
“<b>What are cestoda?<br></br></b><img></img>”
a subclass of cercomeromorpha (tapeworms)
“<b>do planarians reproduce sexually or asexually?<br></br></b><img></img>”
both
“<b>How do planarians repoduce aseuxally?<br></br></b><img></img>”
by splitting latidunally or splitting in half, fission
“<b>what surface are nephirpores on?<br></br></b><img></img>”
ventral
“<b>flame cells have cilia that beat to filter fluid through slits. True or False?</b>”
true
“<b>Platyhelminths were the first to have what 3 major evolutionary advantages?<br></br></b><img></img>”
3 germ layers, cephalisation, bilateral symmetry
“<b>why are platyhelminths different to nematodes?<br></br></b><img></img>”
nematodes have a cuticle that moults<br></br>platyhelminths are aceolomates vs psuedocolomates<br></br>platyhelminths are hermpahrodites<br></br>
“<b>Why arent platyhelminths worms?<br></br></b><img></img>”
they dont have metametric segmentation<br></br>& are DV flattened, no true body cavity, have protonephridia instead of metanephridia, cephalisation not as defined
“<b>what are proglottids?</b>”
small repoductive units segments. will break off, and release through host species
Platyhelminths
Simple, unsegmented protostomes<br></br>dorsoventrally flattened body <br></br>Acoelomate<br></br>Gastrovascular cavity and hydrostatic skeleton<br></br>- 1 0r 2 Suckers<br></br>- No specialsed organs for gas exchange<br></br>- Absord and eliminate gasses across surface<br></br>-Cephalisation
“<b>What is a protonephridia in platyhelminths?</b>”
Basic excretion organ<br></br>proto (early) neprdidia (head)
Three Platyhelminths classes?
Turbellaria - Planarians<br></br>Tremadtoda<br></br>Cercomermorpha
“<b>How do flatworms excrete waste & respire?</b>”
“Respire across body surface, because they are so thin<br></br>have no organs for gas exchanges”
“<b>What type of organs do platyhelminths have for respiration?</b>”
None
“<b>What are 3 ways platyhelminths are different to real worms?</b>”
no segmentation, flat, no true body cavity
“<b>How are platyhelminths different to nematodes?</b>”
“b/cuz they are hermaphrodites, not clynidrical, & not psuedocolomates”
“<b>Which Phlya was the first to show bilateral symmetry?</b>”
Platyhelminths
