Download ROUNDWORMS

ROUNDWORMS
Kingdom Animalia - Phylum
Nematoda
--Unsegmented worms
--Pseudocoelom
("false coelom")
-- body cavity contains
organs
Digestive tract with 2 openings:
mouth & anus
Feeding
Free-living - predators
Parasites - humans and
animals
Reproduction: Sexual
reproduction,
Separate sexes
Roundworms & Disease
Trichinosis
(trichinella worm)
- cysts within the muscles are
consumed (undercooked
food)
-- worm grows in intestine
-- forms cysts in the muscles
of the new host
-- symptom: terrible pain in
muscles
Filarial Worms - found in Tropical regions of
Asia
-- usually transmitted
by mosquitoes
-- causes elephantiasis
Ascarid Worms (common
roundworm)
- lives in intestine
- eggs
are passed
Most roundworms
infectout in the feces
dogs, but occasionally
they find their way into
human hosts
Hookworms
- burrow into the skin from soil
- mature in the intestines
--hooks used to attach and suck blood
Research on C. elegans
●first organism to have DNA completely
sequenced
●It is a very simple, free living roundworm