helminths

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helminths
- eukaryotic
- linear DNA
- lacks cell wall
- multicellular
- may be motile
2 types of helminths
- platyhelminthes
- nemathelminthes
platyhelminthes
flatworms
- adults have flattened body
- head
- bilateral symmetry
- organ systems
- - nervous & reproductive (hermaphroditic)
types of platyhelminthes
- cestoda (segmented - tapeworms)
- trematoda (non-segmented - flukes)
nemathelminthes
roundworms
- - adults have cylindrically shaped bodies
- - tapered on both ends
- - bilateral symmetry
- - organ sys
- --> digestive (w/mouth & anus), reproductive (male & female), primitive nervous sys
cestoda
- (platyhelminthes)
- >segmented
- >tapeworms
- - no digestive sys
- - larvae & cyst infect "animal" tissue
- - adults infect human intestines
trematoda
- (playthelminthes)
- >non-segmented
- >flukes
- - digestive sys: common mouth & anus
- - larvae infect aquatic animals & plants
- (snail, clam, fish, crab, aquatic plants)
- - adults infect humans (liver, lungs, BVs)
types of namethelminthes
- whipworms (ingested or pass thru skin --> liver)
- trichina worms
- hookworms
- pinworms (common in kids; in L intestine & perianal area)
- filarids
- ascarids (can affect lungs --> fever & cough)