Phylum Platyhelminthes Flashcards
Commonly called _
flatworms
Platyhelminthes germ layer
Endoderm, mesoderm, ectoderm
Bilateral symmetry first appears in _
Platyhelmithes
What is cephalization?
Possessing a head where central nervous system (cerebral ganglion) and sensory organs are located
Can a planaria continuously eat? Why or why not?
Cannot due to the fact that pharynx acts as both throat and anus
what feature is missing in flatworms?
anus
what organism is intermediate host for Trematoda repro?
snail
what feature is critical to tapeworm repro?
proglottid
what is one common way humans contract tapeworms
eating uncooked meat
anterior
mouth
posterior
booty
dorsal
back
ventral
front
In flatworms what is evolutionarily significance
flattened dorsoventrally
How are nerve cords found in this phylum
in pairs
in freshwater flatworms how many lateral nerve cords are there connected to cerebral ganglia
one
How does osmoregulation occur in this phylum? (what type of cells are lined with _)
flame cells lined with cilia drive fluids through a series of tubules which open to outside through a series of pores
How does excretion and respiration happen in this phylum?
simple diffusion
flattened body aids in process which is easier for diffusion