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Worms. What’s Eating You for Dinner ?. FLATWORMS PHYLUM: Platyhelminthes. FREE LIVING PARASITIC Planaria Flukes & Tapeworms. FLATWORMS ARE ACOELOMATES. PARASITIC WORMS. Animal host where ADULT feeds and reproduces = PRIMARY HOST

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Worms

What’s Eating You for Dinner ?


FLATWORMSPHYLUM:Platyhelminthes

FREE LIVINGPARASITIC

Planaria Flukes

& Tapeworms

FLATWORMS ARE ACOELOMATES


PARASITIC WORMS

Animal host where ADULT feeds and reproduces = PRIMARY HOST

Animal host where LARVAL formlives and feeds = INTERMEDIATE

HOST


HUMAN BLOOD FLUKESchistosoma

Adult worms mature & reproduce in blood vessels (PRIMARY HOST) ; eggs travel to intestines or bladder

Immature worm burrows through skininto blood vessels

Larvae grow tails and leave snail

Eggs leave body in urine or feces

Larva hatches from egg & infects snail(intermediate host)


PARASITIC FLATWORMSchistosoma

Eggs can block blood vessels to organs causing irritation, bleeding, tissue decay

= __________________

SCHISTOSOMIASIS

http://www.coc.org/focus/food/pics/rice_paddy.jpg


TAPEWORMS

Dog tapeworm

PARASITIC FLATWORM (lives in HOST animal intestines)


TAPEWORM

Attaches by scolex and absorbs nutrients through skin

Tegument protects them from host digestive enzymes and immune system


COVERING for PROTECTION

CUTICLE-NON-CELLULARcoating made by cells

TEGUMENT-

CELLS fused together

like armor


Tapeworm SCOLEX

Head with suckers and hooks to help hold on inside host


TAPEWORMS

PROGLOTTIDShermaphroditic reproductive structures

(contain both male & female sex organs)

EGGS INSIDE


TAPEWORMS

Can grow 30-50 ft

(2000 proglottids)

Add new proglottids behind scolex

Mature ones drop off at tail end and leave body in feces


BEEF TAPEWORM

Adults attachinside intestines

and absorb

digested food

Humans eat undercooked meat

containing cysts

Intermediate

host

Primary host

Proglottids burst releasing eggs with larvae inside on ground

Proglottids arereleased in feces

Cows eat grass; larvae travel through blood vessels;

make cysts in muscle

http://net.unl.edu/wonderwise/12parasi/a-para.htm


ROUND WORMSPHYLUM:Nematoda

Some FREE LIVINGPARASITIC

Ascaris

Trichinella

Hookworms

Pinworms

Filarial worms

ROUND WORMS ARE PSEUDOCOELOMATES


PARASITIC ROUND WORM

Ascaris

Lives in intestines ofhumans, pigs, horses

Feed on passing food

Females can grow up to 1 ft long & produce 200,000 eggs/day

http://www.biosci.ohio-state.edu/~parasite/images.html


ASCARIS LIFE CYCLE

Larvae are coughed up & swallowed;Return to intestines; mature & mate

Eggs leave body in feces and enter new host incontaminated food/water

Develop into larvae and burrow through wall into blood vessels

http://www.extension.iastate.edu/polk/health/carbon/fact3.htm

http://www.biosci.ohio-state.edu/~parasite/lifecycles/trichinella_lifecycle.html


PARASITIC ROUND WORMSTrichinella

Intermediate host

Cysts release larvae that burrowinto intestinal wall &mature

Humans infected by eating undercooked meat containing cysts

Primary host

Larvae forms cysts in muscle

Adults release larvae that travel through bloodstreamto muscles

http://jeggeri.pri.ee/Kontuur/Loomad/pig.gif http://www.biosci.ohio-state.edu/~parasite/lifecycles/trichinella_lifecycle.html


PARASITIC ROUND WORMS

Trichinella –

Larvae leave intestine and travel through blood vessels to muscle where they make cysts

Muscle pain & stiffnessCan be fatal if cysts form in heart

= _______________________

TRICHINOSIS-


PARASITIC ROUND WORMS

FILARIAL WORMSlarvae are carried by insects

EX: DOG HEARTWORMCarried by mosquitoes


FILARIAL ROUND WORMS

Elephantiasis

Adult worms live in lymph nodes causing blockage so fluid back ups


ELEPHANTIASIS

Common in tropical countries

Adult worms can grow to 4” long


ELEPHANTIASIS


Mosquito picks up larvae from bloodwhen it feeds

Larvae develop into juveniles inside mosquito

Mosquito injects juveniles whichmigrate to lymph nodes and mature

Adult worms live

and reproduce in

lymph vessels

http://www.acm.uiuc.edu/sigbio/project/updated-lymphatic/lymph3.html


FILARIAL ROUND WORMSGuinea worm


PARASITIC ROUND WORM Guinea worm

Blisters pop and larvae are released in water

Female bodies under skin fill with eggs and break open; larvae form blisters

Larvae eaten by small crustaceansHumans infected by drinking water

Larvae mature and adult wormsmigrate to skin


FILARIAL ROUND WORMS Loa loa


Loa Loa worm

  • Humans are infected with larvae when bitten by loa fly

  • Larvae mature & crawl around under skin (especially near face)

  • Adults mate and produce larvae which can be picked up by another fly and transmitted to another person


PARASITIC ROUND WORMSHookworms

Ancylostoma


HOOKWORM LIFE CYCLE

Return to intestines; mature & mate

Larvae are coughed up & swallowed;

Adult worms live in intestine and feed on blood

Larvae enter body by burrowing through skin on feet & travel to lungs

Eggs leave body in fecesand hatch as larvae in soil

http://www.barefooters.org/1995-spring/gifs/mtn_pjl_feet.jpg

http://www.extension.iastate.edu/polk/health/carbon/fact3.htm

http://www.retiredgreyhounds.co.uk/page12.htm


Hookworms in Humans

  • PROBLEMS caused by migrating larvae

  • Cause intense reaction in skin at site

  • Infect 40 million people worldwide


PARASITIC ROUND WORMSPinworms

  • Most common parasitic infection in United States

  • 1/5 children are infected


PARASITIC ROUND WORMSPinworms

  • Worms live in intestine

  • Females crawl out through anus at night and lay eggs on skin

  • Intense itching causes host to scratch

  • Eggs under fingernails and on hands are spread back to self or to others when objects/food are touched


SEGMENTED WORMSPHYLUM:Annelida

FREE LIVINGPARASITIC

Earthworms Leeches

SEGMENTED WORMS ARE EUCOELOMATES


LEECHES

Medical uses


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