Flate Worms

describe a flateworm 

they are  acoelomates with bilateral symmetry 

phylum: Platyhelminthes

bodies; thin ribben like, definit head with organs 

most are parasitic some are free living 

free living: feeding and digestion

they feed on dead or slow organisms

they have tublelike out of their mouth named pharynx

paracitic: feeding and digestions

they use hooks or suckers to attach themselves to their host

they ave reduced digestive systems or non and directly absorb

circulatory and resprotory systems

they dont have they use diffusion to move dissolved oxygen and nuetriens 

excertion

they have an excertory system made up uf small tubes

flame cell: lined up with cilia to sweep watwer and excertion sustances into tubules

they alsoo excert from their mouth

responds to stimuli

they have 2 nerve cords with a connecting tissue

at the end of the nerve cord they have a Ganglion, a group of nerve cell bodies that coordinate incoming and outgoing nerve signals

movement

they move by contracting their muscles in their body walls

they glide using cilia on the bottom side of their body

reproduction

flateworms are hermaphrodites

they exchange sperms and eggs and fertilize internally

free living can also reproduce by regeneration their lost or cut of parts can grow on their own

mention three different flat worm classes

Turbellarians: Turbellaria

Trematodes: Trematoda 

Cestodes: Cestoda

Turbellarians

Class turbellaria free swimming flatworms

they have eyespots that can detect the absence and presence of light

they have chemical detecting cells

termatodes

class termotodes are parasitic flukes

pften requir two hosts

cestodes

class cestoda are tape worms

they scolex on both ends with hooks and suckers that attach to their hosts intestines

their bodies are composed of individual segments called proglottids, each of which contains muscles, nerve cells, flame cells, and reproductive organs.