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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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  1. Worms What’s Eating You for Dinner ?


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

  4. 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)

  5. PARASITIC FLATWORMSchistosoma Eggs can block blood vessels to organs causing irritation, bleeding, tissue decay = __________________ SCHISTOSOMIASIS

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

  7. TAPEWORM Attaches by scolex and absorbs nutrients through skin Tegument protects them from host digestive enzymes and immune system

  8. COVERING for PROTECTION CUTICLE-NON-CELLULARcoating made by cells TEGUMENT- CELLS fused together like armor

  9. Tapeworm SCOLEX Head with suckers and hooks to help hold on inside host

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

  11. 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

  12. 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

  13. ROUND WORMSPHYLUM:Nematoda Some FREE LIVINGPARASITIC Ascaris Trichinella Hookworms Pinworms Filarial worms ROUND WORMS ARE PSEUDOCOELOMATES

  14. 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

  15. 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

  16. 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 

  17. 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-

  18. PARASITIC ROUND WORMS FILARIAL WORMSlarvae are carried by insects EX: DOG HEARTWORMCarried by mosquitoes

  19. FILARIAL ROUND WORMS Elephantiasis Adult worms live in lymph nodes causing blockage so fluid back ups

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


  22. 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


  24. 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


  26. 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

  27. PARASITIC ROUND WORMSHookworms Ancylostoma

  28. 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

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

  30. PARASITIC ROUND WORMSPinworms • Most common parasitic infection in United States • 1/5 children are infected

  31. 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


  33. LEECHES Medical uses

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