lab test- flatworms

what are the 2 types of flat worms

free living and parasitic

what are the defining traits of flatworms

lack any body cavity and segmentation

filled with mesenchyme

dorso-ventrally flat

gastrovascular cavity

what is being triploblastic

3 embryonic tissue layers- endoderm. mesoderm, endoderm

what do flatworms lack 

circulatory and respiratory systems

how do flatworms still get stuff through their body without respitory and cicirlatory system 

diffusion 

nervous system

linear anterior-posterior nervous system composed of 2 main trunks with cross- connections and paired cerebral gangila 

phylum playhelminthes

trematoda- flukes 

turbellaria- free living, planaria 

cestoda- tapeworms 

Turbellaria 

planarian 

planarian digestive tract

starts with mouth- part of extensible pharynx that sits in the pharyngeal cavity bounded by the pharyngeal sheath

the pharynx connects to the gastrovascular cavity.

what systems do the planarian/flat worms not have

circulatory, respiratory, and excretory

how do flatworms get stuff out after eating it

proronephridium

blind gut 

has flame cells, excretory ducts, and excretory pores 

flat worm reproductive system

testes produces sperm that mature in the vas deferens/ seminal vesicle and transported to the penis bulb and penis 

sperm from another flatworm will be recieved/ stored in the seminal receptacle 

eggs are produced in an ovary and transported in an oviduct 

recieving nuriousment from a yolk gland and its ducts before passing it to the uterous after fertliziation 

flatworm nervous system

lader like

2 lateral cords joined by a transverse nerves 

photoreceptor eye spots sitting above the 2 small cerbral gangila 

flatworms muscle system

circular- contracts- extends

lonitudianal muscles- withdrawls- perimider of the body wall below the epidermis

surnch and pull 

flat worm body comp

epidermis surrounds circular muscle that girdles the worm

cilliated on the vental side 

circular muscle surrounds the longitudinal muscle 

bilateral symmetry

passage ways- lumen lined with epithelium

acoelomate

cestoda

tapeworm 

whats at the anterior end of the tapeowrm

scolex

scolex characteristics

suckers and hooks to attach

what are the segments attached to the scolex

proglottids

immature nearest the scolex

then mature

them gravid

what are the immature proglottids for

devoted to reproduction