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Worms

Worms. What’s Eating You for Dinner ?. http://curezone.com/image_gallery/parasites/all/default.asp?i=1&n=75. FLATWORMS PYLUM: Platyhelminthes. FREE LIVING PARASITIC Planaria Flukes & Tapeworms. FLATWORMS ARE ACOELOMATES. PLANARIA. NOT PARASITES.

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Worms

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  1. Worms What’s Eating You for Dinner ? http://curezone.com/image_gallery/parasites/all/default.asp?i=1&n=75

  2. FLATWORMSPYLUM: Platyhelminthes FREE LIVINGPARASITIC Planaria Flukes & Tapeworms FLATWORMS ARE ACOELOMATES

  3. PLANARIA NOTPARASITES

  4. GASTROVASCULAR CAVITY(Combination Digestive & circulatory) • One opening digestivecavity http://www.lima.ohio-state.edu/biology/biodiv/animal/planarlp.jpg

  5. FLAME CELLS • Collect excess water and nitrogen waste • Excreted through pores in skin Moving cilia looklike little “flames”

  6. REPRODUCTION SEXUAL- (hermaphrodites but trade with partner) ASEXUAL- can use regeneration to grow a new organism from parts

  7. PARASITIC WORMS Animal host where ADULT feeds and reproduces = PRIMARY HOST Animal host where LARVAL formlives and feeds = INTERMEDIATE HOST

  8. HUMAN BLOOD FLUKESchistosoma Adult worms mature & reproduce in blood vessels; 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)

  9. PARASITIC FLATWORMSchistosoma NOT IN USA but infects over 250 million people worldwide Worms can block blood vessels to organs causing irritation, bleeding, tissue decay = __________________ SCHISTOSOMIASIS http://www.coc.org/focus/food/pics/rice_paddy.jpg

  10. TAPEWORMS Dog tapeworm PARASITIC FLATWORM (lives in HOST animal intestines)

  11. Attaches with SCOLEX Head with suckers and hooks to help hold on inside host

  12. TAPEWORM NO DIGESTIVE SYSTEM -absorbs nutrients through skin TEGUMENT protects them from host digestive enzymes and immune system

  13. TAPEWORMS PROGLOTTIDShermaphroditic reproductive structures (contain both male & female sex organs) EGGS INSIDE

  14. http://curezone.com/image_gallery/parasites/all/default.asp?i=65&n=75http://curezone.com/image_gallery/parasites/all/default.asp?i=65&n=75 TAPEWORMS Can grow up to 30 ft (2000 proglottids) Add new proglottids behind scolex Mature ones drop off at tail end and leave body in feces

  15. EX: BEEF TAPEWORM Adults attachinside intestines and absorb digested food Humans eat undercooked meat containing cysts 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

  16. ROUND WORMSNematoda Ascaris Trichinella Hookworms Pinworms Filarial worms http://curezone.com/image_gallery/parasites/all/default.asp?i=1&n=75 ROUND WORMS ARE PSEUDOCOELOMATES

  17. PARASITIC ROUND WORM Ascaris Lives in intestines 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

  18. ASCARISLIFE 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

  19. http://curezone.com/image_gallery/parasites/all/default.asp?i=0&n=75http://curezone.com/image_gallery/parasites/all/default.asp?i=0&n=75 Most common worm infection world wide Mostly in children Estimated 25% of world’s population is infected with Ascaris

  20. PARASITIC ROUND WORMSTrichinella Cysts release larvae that burrowinto intestinal wall &mature Humans infected by eating undercooked meat containing cysts   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

  21. 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-

  22. TRICHINOSIS Less than 100 cases/year in USA from PORK Most from eating wild game Curing (salting), drying, smoking, or microwaving meat does not consistently kill infective worms.

  23. FILARIAL ROUND WORMS are transmitted by insects

  24. FILARIAL ROUND WORMS Elephantiasis Adult worms live in lymph nodes causing blockage so fluid back ups http://www2.niaid.nih.gov/NR/rdonlyres/32FF6DCF-75CF-42D0-BCAE-297EFDE27CF1/0/elephantiasis.jpg

  25. ELEPHANTIASIS Common in tropical countries Adult worms can grow to 4” long

  26. ELEPHANTIASIS

  27. 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

  28. FILARIAL ROUND WORMS DOG HEARTWORMCarried by mosquitoes http://curezone.com/image_gallery/parasites/all/default.asp?i=66&n=75

  29. FILARIAL ROUND WORMS Loa loa Found in AFRICA http://www.biosci.ohio-state.edu/~parasite/loa.html

  30. 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 http://maven.smith.edu/~sawlab/fgn/pnb/loaloa.html

  31. PARASITIC ROUND WORMSGuinea worm http://curezone.com/image_gallery/parasites/all/default.asp?i=5&n=75 Found in AFRICA http://curezone.com/image_gallery/parasites/all/default.asp?i=6&n=75

  32. PARASITIC ROUND WORM Guinea worm http://curezone.com/image_gallery/parasites/all/default.asp?i=5&n=75  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 http://curezone.com/image_gallery/parasites/all/default.asp?i=6&n=75

  33. PARASITIC ROUND WORMSHookworms http://curezone.com/image_gallery/parasites/all/default.asp?i=1&n=75 Live in intestine; feed on BLOOD http://www.biosci.ohio-state.edu/~parasite/placoconus.html Ancylostoma

  34. 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.extension.iastate.edu/polk/health/carbon/fact3.htm http://www.retiredgreyhounds.co.uk/page12.htm http://www.barefooters.org/1995-spring/gifs/mtn_pjl_feet.jpg

  35. Hookworms in Humans • PROBLEMS caused by migrating larvae • Cause intense reaction in skin at site • Infect 40 million people worldwide

  36. Parasitic ROUND WORMSPinworms • Most common parasitic infection in United States • 1/5 children are infected • Worldwide500 million people are infected with pinworms Grow up to ½ inch long http://curezone.com/image_gallery/parasites/all/default.asp?i=16&n=75

  37. Parasitic ROUND WORMSPinworms • Worms live in intestine • Females crawl out through anus at night and lay 15,000/day 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

  38. SEGMENTED WORMSAnnelida FREE LIVINGPARASITIC Earthworms Leeches SEGMENTED WORMS ARE EUCOELOMATES

  39. LEECHES Medical uses

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